Enable workflow testing + fix header (#8512)

- clean execution header
- enable test on workflows + add snack bar
- display snack bar error if workflow cannot be tested

Behaviour still need to be validated by @Bonapara 
<img width="880" alt="Capture d’écran 2024-11-15 à 12 16 36"
src="https://github.com/user-attachments/assets/1dab0c3b-157c-449f-aee7-4c8cf2e369a6">
<img width="880" alt="Capture d’écran 2024-11-15 à 12 16 48"
src="https://github.com/user-attachments/assets/16279611-0a58-4fe6-b117-0192714a6d5c">

packages/twenty-front/src/modules/workflow/hooks/useRunWorkflowVersion.ts

@@ -15,10 +15,13 @@ export const useRunWorkflowVersion = () => {
     client: apolloMetadataClient,
   });
 
-  const runWorkflowVersion = async (
-    workflowVersionId: string,
-    payload?: Record<string, any>,
-  ) => {
+  const runWorkflowVersion = async ({
+    workflowVersionId,
+    payload,
+  }: {
+    workflowVersionId: string;
+    payload?: Record<string, any>;
+  }) => {
     await mutate({
       variables: { input: { workflowVersionId, payload } },
     });