Hide iteration switcher for steps following iterators (#14810)

## Before


https://github.com/user-attachments/assets/a8eca1aa-b2b6-4fdb-8848-65c8235a330c

## After


https://github.com/user-attachments/assets/84b7e969-423b-4f0e-8f53-524bfb11e2ca

packages/twenty-front/src/modules/workflow/workflow-diagram/utils/isParentStep.ts

@@ -1,33 +0,0 @@
-import { type WorkflowStep } from '@/workflow/types/Workflow';
-import { isLastStepOfLoop } from '@/workflow/workflow-diagram/utils/isLastStepOfLoop';
-
-export const isParentStep = ({
-  currentStep,
-  potentialParentStep,
-  steps,
-}: {
-  currentStep: WorkflowStep;
-  potentialParentStep: WorkflowStep;
-  steps: WorkflowStep[];
-}): boolean => {
-  if (potentialParentStep.type === 'ITERATOR') {
-    return !!(
-      potentialParentStep.settings.input.initialLoopStepIds?.includes(
-        currentStep.id,
-      ) || potentialParentStep.nextStepIds?.includes(currentStep.id)
-    );
-  }
-
-  if (currentStep.type === 'ITERATOR') {
-    return !!(
-      potentialParentStep.nextStepIds?.includes(currentStep.id) &&
-      !isLastStepOfLoop({
-        iterator: currentStep,
-        stepId: potentialParentStep.id,
-        steps,
-      })
-    );
-  }
-
-  return !!potentialParentStep.nextStepIds?.includes(currentStep.id);
-};

packages/twenty-front/src/modules/workflow/workflow-steps/utils/__tests__/getIsDescendantOfIterator.test.ts

@@ -68,11 +68,10 @@ describe('getIsDescendantOfIterator', () => {
     ).toBe(true);
   });
 
-  it('returns true for indirect descendant', () => {
-    // step3 is pointed to by iterator1.nextStepIds
+  it('returns false for indirect descendant', () => {
     expect(
       getIsDescendantOfIterator({ stepId: codeStep3.id, steps: workflow }),
-    ).toBe(true);
+    ).toBe(false);
   });
 
   it('returns false for iterator itself', () => {
@@ -109,5 +108,3 @@ describe('getIsDescendantOfIterator', () => {
     ).toBe(false);
   });
 });
-
-// ...existing test code...

packages/twenty-front/src/modules/workflow/workflow-steps/utils/getIsDescendantOfIterator.ts

@@ -1,7 +1,38 @@
 import { type WorkflowStep } from '@/workflow/types/Workflow';
-import { isParentStep } from '@/workflow/workflow-diagram/utils/isParentStep';
+import { isLastStepOfLoop } from '@/workflow/workflow-diagram/utils/isLastStepOfLoop';
 import { TRIGGER_STEP_ID } from 'twenty-shared/workflow';
 
+const isParentStep = ({
+  currentStep,
+  potentialParentStep,
+  steps,
+}: {
+  currentStep: WorkflowStep;
+  potentialParentStep: WorkflowStep;
+  steps: WorkflowStep[];
+}): boolean => {
+  if (potentialParentStep.type === 'ITERATOR') {
+    return (
+      potentialParentStep.settings.input.initialLoopStepIds?.includes(
+        currentStep.id,
+      ) === true
+    );
+  }
+
+  if (currentStep.type === 'ITERATOR') {
+    return (
+      potentialParentStep.nextStepIds?.includes(currentStep.id) === true &&
+      !isLastStepOfLoop({
+        iterator: currentStep,
+        stepId: potentialParentStep.id,
+        steps,
+      })
+    );
+  }
+
+  return potentialParentStep.nextStepIds?.includes(currentStep.id) === true;
+};
+
 export const getIsDescendantOfIterator = ({
   stepId,
   steps,

packages/twenty-front/src/modules/workflow/workflow-steps/utils/getWorkflowPreviousSteps.ts

@@ -1,5 +1,36 @@
 import { type WorkflowStep } from '@/workflow/types/Workflow';
-import { isParentStep } from '@/workflow/workflow-diagram/utils/isParentStep';
+import { isLastStepOfLoop } from '@/workflow/workflow-diagram/utils/isLastStepOfLoop';
+
+const isParentStep = ({
+  currentStep,
+  potentialParentStep,
+  steps,
+}: {
+  currentStep: WorkflowStep;
+  potentialParentStep: WorkflowStep;
+  steps: WorkflowStep[];
+}): boolean => {
+  if (potentialParentStep.type === 'ITERATOR') {
+    return !!(
+      potentialParentStep.settings.input.initialLoopStepIds?.includes(
+        currentStep.id,
+      ) || potentialParentStep.nextStepIds?.includes(currentStep.id)
+    );
+  }
+
+  if (currentStep.type === 'ITERATOR') {
+    return !!(
+      potentialParentStep.nextStepIds?.includes(currentStep.id) &&
+      !isLastStepOfLoop({
+        iterator: currentStep,
+        stepId: potentialParentStep.id,
+        steps,
+      })
+    );
+  }
+
+  return !!potentialParentStep.nextStepIds?.includes(currentStep.id);
+};
 
 export const getPreviousSteps = ({
   steps,