Refactor variable management methods to use async naming

Updated method names in `IWorkflowInstanceVariableManager` and `WorkflowInstanceVariableManager` to use the `Async` suffix for consistency. This change improves code readability and aligns with async programming conventions.

src/modules/Elsa.Workflows.Api/Endpoints/WorkflowInstances/Variables/List/Endpoint.cs

@@ -27,7 +27,7 @@ public override async Task HandleAsync(CancellationToken cancellationToken)
             return;
         }
 
-        var variables = await workflowInstanceVariableManager.GetVariables(workflowInstanceId, cancellationToken).ToList();
+        var variables = await workflowInstanceVariableManager.GetVariablesAsync(workflowInstanceId, cancellationToken).ToList();
         var variableModels = variables.Select(x => new ResolvedVariableModel(x.Variable.Id, x.Variable.Name, x.Value)).ToList();
         var response = new ListResponse<ResolvedVariableModel>(variableModels);
         await SendOkAsync(response, cancellationToken);

src/modules/Elsa.Workflows.Api/Endpoints/WorkflowInstances/Variables/Post/Endpoint.cs

@@ -27,7 +27,7 @@ public override async Task HandleAsync(Request request, CancellationToken cancel
             return;
         }
 
-        var resolvedVariables = await workflowInstanceVariableManager.SetVariables(workflowInstanceId, request.Variables, cancellationToken).ToList();
+        var resolvedVariables = await workflowInstanceVariableManager.SetVariablesAsync(workflowInstanceId, request.Variables, cancellationToken).ToList();
         var variableModels = resolvedVariables.Select(x => new ResolvedVariableModel(x.Variable.Id, x.Variable.Name, x.Value)).ToList();
         var response = new ListResponse<ResolvedVariableModel>(variableModels);
         await SendOkAsync(response, cancellationToken);

src/modules/Elsa.Workflows.Management/Contracts/IWorkflowInstanceVariableManager.cs

@@ -8,15 +8,15 @@ public interface IWorkflowInstanceVariableManager
     /// <param name="workflowInstanceId">The ID of the workflow instance.</param>
     /// <param name="cancellationToken">The cancellation token to cancel the operation.</param>
     /// <returns>A task that represents the asynchronous operation. The task result contains a collection of <see cref="ResolvedVariable"/> instances.</returns>
-    Task<IEnumerable<ResolvedVariable>> GetVariables(string workflowInstanceId, CancellationToken cancellationToken = default);
+    Task<IEnumerable<ResolvedVariable>> GetVariablesAsync(string workflowInstanceId, CancellationToken cancellationToken = default);
 
     /// <summary>
     /// Retrieves all variables from the specified <see cref="WorkflowExecutionContext"/>.
     /// </summary>
     /// <param name="workflowExecutionContext">The context of the workflow execution.</param>
     /// <param name="cancellationToken">The cancellation token to cancel the operation.</param>
     /// <returns>A task that represents the asynchronous operation. The task result contains a collection of <see cref="ResolvedVariable"/> instances.</returns>
-    Task<IEnumerable<ResolvedVariable>> GetVariables(WorkflowExecutionContext workflowExecutionContext, CancellationToken cancellationToken = default);
+    Task<IEnumerable<ResolvedVariable>> GetVariablesAsync(WorkflowExecutionContext workflowExecutionContext, CancellationToken cancellationToken = default);
 
     /// <summary>
     /// Sets the specified variables in the specified workflow instance.
@@ -25,7 +25,7 @@ public interface IWorkflowInstanceVariableManager
     /// <param name="variables">The collection of variables to set.</param>
     /// <param name="cancellationToken">The cancellation token to cancel the operation.</param>
     /// <returns>A complete list of resolved variables.</returns>
-    Task<IEnumerable<ResolvedVariable>> SetVariables(string workflowInstanceId, IEnumerable<VariableUpdateValue> variables, CancellationToken cancellationToken = default);
+    Task<IEnumerable<ResolvedVariable>> SetVariablesAsync(string workflowInstanceId, IEnumerable<VariableUpdateValue> variables, CancellationToken cancellationToken = default);
 
     /// <summary>
     /// Sets the specified variables in the given <see cref="WorkflowExecutionContext"/>.
@@ -34,5 +34,5 @@ public interface IWorkflowInstanceVariableManager
     /// <param name="variables">The collection of variables to set.</param>
     /// <param name="cancellationToken">The cancellation token to cancel the operation.</param>
     /// <returns>A complete list of resolved variables.</returns>
-    Task<IEnumerable<ResolvedVariable>> SetVariables(WorkflowExecutionContext workflowExecutionContext, IEnumerable<VariableUpdateValue> variables, CancellationToken cancellationToken = default);
+    Task<IEnumerable<ResolvedVariable>> SetVariablesAsync(WorkflowExecutionContext workflowExecutionContext, IEnumerable<VariableUpdateValue> variables, CancellationToken cancellationToken = default);
 }

src/modules/Elsa.Workflows.Management/Services/WorkflowInstanceVariableManager.cs

@@ -7,19 +7,19 @@ public class WorkflowInstanceVariableManager(
     IWorkflowInstanceVariableReader variableReader,
     IWorkflowInstanceVariableWriter variableWriter) : IWorkflowInstanceVariableManager
 {
-    public async Task<IEnumerable<ResolvedVariable>> GetVariables(string workflowInstanceId, CancellationToken cancellationToken = default)
+    public async Task<IEnumerable<ResolvedVariable>> GetVariablesAsync(string workflowInstanceId, CancellationToken cancellationToken = default)
     {
         var workflowExecutionContext = await GetWorkflowExecutionContextAsync(workflowInstanceId, cancellationToken);
         if (workflowExecutionContext == null) return [];
         return await variableReader.GetVariables(workflowExecutionContext, cancellationToken);
     }
 
-    public Task<IEnumerable<ResolvedVariable>> GetVariables(WorkflowExecutionContext workflowExecutionContext, CancellationToken cancellationToken = default)
+    public Task<IEnumerable<ResolvedVariable>> GetVariablesAsync(WorkflowExecutionContext workflowExecutionContext, CancellationToken cancellationToken = default)
     {
         return variableReader.GetVariables(workflowExecutionContext, cancellationToken);
     }
 
-    public async Task<IEnumerable<ResolvedVariable>> SetVariables(string workflowInstanceId, IEnumerable<VariableUpdateValue> variables, CancellationToken cancellationToken = default)
+    public async Task<IEnumerable<ResolvedVariable>> SetVariablesAsync(string workflowInstanceId, IEnumerable<VariableUpdateValue> variables, CancellationToken cancellationToken = default)
     {
         var workflowExecutionContext = await GetWorkflowExecutionContextAsync(workflowInstanceId, cancellationToken);
         if (workflowExecutionContext == null) return [];
@@ -28,7 +28,7 @@ public async Task<IEnumerable<ResolvedVariable>> SetVariables(string workflowIns
         return resolvedVariables;
     }
 
-    public Task<IEnumerable<ResolvedVariable>> SetVariables(WorkflowExecutionContext workflowExecutionContext, IEnumerable<VariableUpdateValue> variables, CancellationToken cancellationToken = default)
+    public Task<IEnumerable<ResolvedVariable>> SetVariablesAsync(WorkflowExecutionContext workflowExecutionContext, IEnumerable<VariableUpdateValue> variables, CancellationToken cancellationToken = default)
     {
         return variableWriter.SetVariables(workflowExecutionContext, variables, cancellationToken);
     }