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/states/workflowDiagramState.ts

@@ -1,7 +0,0 @@
-import { WorkflowDiagram } from '@/workflow/types/WorkflowDiagram';
-import { createState } from '@ui/utilities/state/utils/createState';
-
-export const workflowDiagramState = createState<WorkflowDiagram | undefined>({
-  key: 'workflowDiagramState',
-  defaultValue: undefined,
-});