Delete filter on branch deletion (#13834)

When the target is not in the direct next step ids of the source (step
or trigger), check if there is a filter between both. If yes, delete the
filter and remove it from source next step ids.

Also refactored the existing.

packages/twenty-front/src/modules/workflow/utils/findStepPosition.ts

@@ -1,6 +1,6 @@
 import { type WorkflowStep } from '@/workflow/types/Workflow';
-import { TRIGGER_STEP_ID } from '@/workflow/workflow-trigger/constants/TriggerStepId';
 import { isDefined } from 'twenty-shared/utils';
+import { TRIGGER_STEP_ID } from 'twenty-shared/workflow';
 
 /**
  * This function returns the reference of the array where the step should be positioned