chore: improve monitoring for Non-idempotent ActivateWorkspace mutation fails on

Added `!isSubmitting` guard to the `handleKeyDown` Enter key handler in `CreateWorkspace.tsx`. The button already had `disabled={!isValid || isSubmitting}`, but the Enter key handler bypassed this check, allowing duplicate mutation submissions when pressing Enter rapidly. This reduces noise from duplicate submissions reaching the server.

packages/twenty-front/src/pages/onboarding/CreateWorkspace.tsx

@@ -144,7 +144,7 @@ export const CreateWorkspace = () => {
   );
 
   const handleKeyDown = (event: React.KeyboardEvent<HTMLInputElement>) => {
-    if (event.key === Key.Enter) {
+    if (event.key === Key.Enter && !isSubmitting) {
       event.preventDefault();
       handleSubmit(onSubmit)();
     }

packages/twenty-server/src/engine/core-modules/workspace/services/workspace.service.ts

@@ -304,6 +304,18 @@ export class WorkspaceService extends TypeOrmQueryService<WorkspaceEntity> {
       throw new BadRequestException("'displayName' not provided");
     }
 
+    if (
+      workspace.activationStatus === WorkspaceActivationStatus.ACTIVE
+    ) {
+      this.logger.log(
+        `Workspace ${workspace.id} is already active, returning existing workspace`,
+      );
+
+      return await this.workspaceRepository.findOneBy({
+        id: workspace.id,
+      });
+    }
+
     if (
       workspace.activationStatus === WorkspaceActivationStatus.ONGOING_CREATION
     ) {