Add comments to mockAlluxioEngineWithClient(name, ns string, port int32) *AlluxioEngine in pkg/ddc/alluxio/api_gateway_test.go

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mockAlluxioEngineWithClient(name, ns string, port int32) *AlluxioEngine in pkg/ddc/alluxio/api_gateway_test.go

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// mockAlluxioEngineWithClient creates and returns a mock AlluxioEngine instance with a fake Kubernetes client.
// It sets up a mock Service object representing an Alluxio master service with the given name, namespace, and REST port.
// Parameters:
// - name: The base name for the Alluxio resources (will be used to generate the master service name)
// - ns: The namespace where the Alluxio resources are located
// - port: The port number for the REST API service
// Returns:
// - *AlluxioEngine: A configured AlluxioEngine instance with a fake client containing the mock Service
//
// This function is typically used in unit tests to simulate interactions with Kubernetes
// without requiring a real cluster. The mock service follows the naming pattern "-master-0".