Handle basepath overrides in Vertex (#16783)

[upstream:c7cbd65591814881d61b20bd5484eda92fd1f414]

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/16783.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+vertexai: fixed operation calls in `google_vertex_ai_` resources not respecting `universe_domain` and `vertex_custom_endpoint`
+```

google-beta/services/vertexai/vertex_ai_operation.go

@@ -8,7 +8,7 @@
 //
 //	This code is generated by Magic Modules using the following:
 //
-//	Source file: https://github.com/GoogleCloudPlatform/magic-modules/tree/main/mmv1/third_party/terraform/services/vertexai/vertex_ai_operation.go.tmpl
+//	Source file: https://github.com/GoogleCloudPlatform/magic-modules/tree/main/mmv1/third_party/terraform/services/vertexai/vertex_ai_operation.go
 //
 //	DO NOT EDIT this file directly. Any changes made to this file will be
 //	overwritten during the next generation cycle.
@@ -19,6 +19,7 @@ package vertexai
 import (
 	"encoding/json"
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/hashicorp/terraform-provider-google-beta/google-beta/tpgresource"
@@ -37,10 +38,11 @@ func (w *VertexAIOperationWaiter) QueryOp() (interface{}, error) {
 		return nil, fmt.Errorf("Cannot query operation, it's unset or nil.")
 	}
 
+	// Replace any occurences of the `{{region}}` tag with `region` directly.
+	// ReplaceVars can't be used because we don't have all of the necessary inputs.
 	region := tpgresource.GetRegionFromRegionalSelfLink(w.CommonOperationWaiter.Op.Name)
-
-	// Returns the proper get.
-	url := fmt.Sprintf("https://%s-aiplatform.googleapis.com/v1beta1/%s", region, w.CommonOperationWaiter.Op.Name)
+	baseUrl := strings.ReplaceAll(w.Config.VertexAIBasePath, "{{region}}", region)
+	url := fmt.Sprintf("%s%s", baseUrl, w.CommonOperationWaiter.Op.Name)
 
 	return transport_tpg.SendRequest(transport_tpg.SendRequestOptions{
 		Config:    w.Config,