Workspace migration v2 testing (#13136)

# Introduction
Introduced `EachTesting` pattern for the builder unit tests.
As always any suggestions are more than welcomed !


Still need to:
- [x] implem basic tests for field
- [x] create `get-flat-index-field-metadata.mock.ts`
- [x] Implement basic tests for index and index-fields
- [ ] Implem standard edges cases tests TDD style

## Misc
- was https://github.com/twentyhq/twenty/pull/13132 closed due to mess
to rebase on main

packages/twenty-server/src/engine/workspace-manager/workspace-migration-v2/utils/flat-field-metadata-comparator.util.ts

@@ -2,6 +2,7 @@ import diff from 'microdiff';
 import { FieldMetadataType } from 'twenty-shared/types';
 import { isDefined } from 'twenty-shared/utils';
 
+import { isRelationFieldMetadataType } from 'src/engine/utils/is-relation-field-metadata-type.util';
 import { FlatFieldMetadata } from 'src/engine/workspace-manager/workspace-migration-v2/types/flat-field-metadata';
 import { FromTo } from 'src/engine/workspace-manager/workspace-migration-v2/types/from-to.type';
 import { UpdateFieldAction } from 'src/engine/workspace-manager/workspace-migration-v2/workspace-migration-builder-v2/types/workspace-migration-field-action-v2';
@@ -18,6 +19,11 @@ const flatFieldMetadataPropertiesToCompare = [
   'name',
   'options',
   'standardOverrides',
+  'settings',
+  // To reactivate once we authorize relation edition, see https://github.com/twentyhq/twenty/commit/39f6f3c4bb101272a9014e142a842d0801a3c33b
+  // 'relationTargetFieldMetadataId',
+  // 'relationTargetObjectMetadataId',
+  ///
 ] as const satisfies (keyof FlatFieldMetadata)[];
 
 export type FlatFieldMetadataPropertiesToCompare =
@@ -26,6 +32,7 @@ export type FlatFieldMetadataPropertiesToCompare =
 const fieldMetadataPropertiesToStringify = [
   'defaultValue',
   'standardOverrides',
+  'settings',
 ] as const satisfies FlatFieldMetadataPropertiesToCompare[];
 
 const shouldNotOverrideDefaultValue = (type: FieldMetadataType) => {
@@ -65,6 +72,15 @@ export const compareTwoFlatFieldMetadata = ({
         return true;
       }
 
+      // Remove below assertion when we authorize relation edition, see https://github.com/twentyhq/twenty/commit/39f6f3c4bb101272a9014e142a842d0801a3c33b
+      if (
+        isDefined(fieldMetadata.type) &&
+        isRelationFieldMetadataType(fieldMetadata.type) &&
+        !['label', 'description', 'isActive'].includes(property)
+      ) {
+        return true;
+      }
+
       return false;
     },
     propertiesToStringify: fieldMetadataPropertiesToStringify,