chore(server): remove unused flat-field-metadata per-object mocks (#22581)

## Context

The `flat-field-metadata/__mocks__/` directory contained 11 large
per-object `as const` mock catalogs (`OPPORTUNITY_FLAT_FIELDS_MOCK`,
`PERSON_FLAT_FIELDS_MOCK`, `PET_FLAT_FIELDS_MOCK`, ...) plus a
`getRelationTargetFlatFieldMetadataMock` helper. An audit of the whole
server package (searching both the constant names and any import of the
directory) showed almost none of them are consumed anymore — tests have
moved to building exactly the fields they need with the
`getFlatFieldMetadataMock` factory.

Usage found:
- `getFlatFieldMetadataMock` (factory): ~25 spec files + 2 core-modules
mocks — **kept**
- `COMPANY_FLAT_FIELDS_MOCK`: 1 spec
(`object-record-event-publisher.spec.ts`), which only used the `name`
field
- The other 10 `*_FLAT_FIELDS_MOCK` catalogs and
`getRelationTargetFlatFieldMetadataMock`: **zero consumers**

## Changes

- Delete the 11 unused `*-flat-fields.mock.ts` catalogs and
`get-morph-or-relation-target-flat-field-metadata-mock.ts` (~4,900
lines). Only `get-flat-field-metadata.mock.ts` remains.
- In `object-record-event-publisher.spec.ts`, build the company `name`
field inline with `getFlatFieldMetadataMock` (wired to
`COMPANY_FLAT_OBJECT_MOCK.id`/`workspaceId`) and replace the three
`COMPANY_FLAT_FIELDS_MOCK.name.type` references with
`FieldMetadataType.TEXT`.

The sibling `flat-object-metadata/__mocks__/` catalogs are untouched —
several of those are still consumed by the morph/relation specs.

## Verification

- `object-record-event-publisher.spec.ts`: 27/27 passing
- `npx nx lint:diff-with-main twenty-server`: green
- `npx nx typecheck twenty-server`: green

https://claude.ai/code/session_01XcGEtwdXQo9uJibGRPexuG

---
_Generated by [Claude
Code](https://claude.ai/code/session_01XcGEtwdXQo9uJibGRPexuG)_

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packages/twenty-server/src/engine/subscriptions/object-record-event/__tests__/object-record-event-publisher.spec.ts

@@ -1,6 +1,7 @@
 import { Test, type TestingModule } from '@nestjs/testing';
 
 import {
+  FieldMetadataType,
   type ObjectsPermissionsByRoleId,
   type RecordGqlOperationFilter,
 } from 'twenty-shared/types';
@@ -11,7 +12,6 @@ import { createEmptyFlatEntityMaps } from 'src/engine/metadata-modules/flat-enti
 import { WorkspaceManyOrAllFlatEntityMapsCacheService } from 'src/engine/metadata-modules/flat-entity/services/workspace-many-or-all-flat-entity-maps-cache.service';
 import { type FlatEntityMaps } from 'src/engine/metadata-modules/flat-entity/types/flat-entity-maps.type';
 import { addFlatEntityToFlatEntityMapsOrThrow } from 'src/engine/metadata-modules/flat-entity/utils/add-flat-entity-to-flat-entity-maps-or-throw.util';
-import { COMPANY_FLAT_FIELDS_MOCK } from 'src/engine/metadata-modules/flat-field-metadata/__mocks__/company-flat-fields.mock';
 import { getFlatFieldMetadataMock } from 'src/engine/metadata-modules/flat-field-metadata/__mocks__/get-flat-field-metadata.mock';
 import { type FlatFieldMetadata } from 'src/engine/metadata-modules/flat-field-metadata/types/flat-field-metadata.type';
 import { COMPANY_FLAT_OBJECT_MOCK } from 'src/engine/metadata-modules/flat-object-metadata/__mocks__/company-flat-object.mock';
@@ -104,7 +104,14 @@ describe('ObjectRecordEventPublisher', () => {
 
   const companyObjectMetadata: FlatObjectMetadata = COMPANY_FLAT_OBJECT_MOCK;
 
-  const companyNameField = COMPANY_FLAT_FIELDS_MOCK.name;
+  const companyNameField = getFlatFieldMetadataMock({
+    objectMetadataId: COMPANY_FLAT_OBJECT_MOCK.id,
+    type: FieldMetadataType.TEXT,
+    name: 'name',
+    label: 'Name',
+    universalIdentifier: 'company-name-field-universal-id',
+    workspaceId,
+  });
 
   const mockFlatFieldMetadataMaps = buildFlatFieldMetadataMaps([
     companyNameField,
@@ -466,7 +473,7 @@ describe('ObjectRecordEventPublisher', () => {
     it('should filter restricted fields from events', async () => {
       const restrictedField = getFlatFieldMetadataMock({
         objectMetadataId: companyObjectMetadata.id,
-        type: COMPANY_FLAT_FIELDS_MOCK.name.type,
+        type: FieldMetadataType.TEXT,
         name: 'secretField',
         universalIdentifier: 'restricted-field-universal-id',
         workspaceId,
@@ -536,7 +543,7 @@ describe('ObjectRecordEventPublisher', () => {
     it('should skip update events when all updated fields are restricted', async () => {
       const restrictedField = getFlatFieldMetadataMock({
         objectMetadataId: companyObjectMetadata.id,
-        type: COMPANY_FLAT_FIELDS_MOCK.name.type,
+        type: FieldMetadataType.TEXT,
         name: 'secretField',
         universalIdentifier: 'restricted-field-universal-id',
         workspaceId,
@@ -597,7 +604,7 @@ describe('ObjectRecordEventPublisher', () => {
     it('should filter diff when restricted fields are updated', async () => {
       const restrictedField = getFlatFieldMetadataMock({
         objectMetadataId: companyObjectMetadata.id,
-        type: COMPANY_FLAT_FIELDS_MOCK.name.type,
+        type: FieldMetadataType.TEXT,
         name: 'secretField',
         universalIdentifier: 'restricted-field-universal-id',
         workspaceId,