Fix the response format for actions/workflows. (#35009)

This PR fixes the response format for the OpenAPI Spec of
`ActionsListRepositoryWorkflows`.
It was specified in the OpenAPI spec as returning a `[]*ActionWorkflow`,
but it actually should return a `api.ActionWorkflowResponse`.

The test already expects an `api.ActionWorkflowResponse` like expected.

routers/api/v1/swagger/action.go

@@ -44,5 +44,5 @@ type swaggerResponseActionWorkflow struct {
 // swagger:response ActionWorkflowList
 type swaggerResponseActionWorkflowList struct {
 	// in:body
-	Body []api.ActionWorkflow `json:"body"`
+	Body api.ActionWorkflowResponse `json:"body"`
 }