Refacto workflow folders (#9302)

- Create separated folders for sections
- Add components
- Add utils and clean old ones
- Add constants
- Rename search variables folder and components

Next steps:
- clean hooks
- clean states

packages/twenty-front/src/modules/workflow/workflow-diagram/constants/CreateStepStepId.ts

@@ -0,0 +1 @@
+export const CREATE_STEP_STEP_ID = 'create-step';

packages/twenty-front/src/modules/workflow/workflow-diagram/constants/EmptyTriggerStepId.ts

@@ -0,0 +1 @@
+export const EMPTY_TRIGGER_STEP_ID = 'empty-trigger';