Deprecate FieldMetadataInterface (#13264)

# Introduction

From the moment replaced the FieldMetadataInterface definition to:
```ts
import { FieldMetadataType } from 'twenty-shared/types';

import { FieldMetadataEntity } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';

export type FieldMetadataInterface<
  T extends FieldMetadataType = FieldMetadataType,
> = FieldMetadataEntity<T>;
```
After this PR merge will create a new one removing the type and
replacing it to `FieldMetadataEntity`.
Did not renamed it here to avoid conflicts on naming + type issues fixs
within the same PR

## Field metadata entity RELATION or MORPH
Relations fields cannot be null for those field metadata entity instance
anymore, but are never for the others see
`packages/twenty-server/src/engine/metadata-modules/field-metadata/types/field-metadata-entity-test.type.ts`
( introduced TypeScript tests )

## Concerns
- TS_VECTOR is the most at risk with the `generatedType` and
`asExpression` removal from interface

## What's next
- `FielMetadataInterface` removal and rename ( see introduction )
- Depcrecating `ObjectMetadataInterface`
- Refactor `FieldMetadataEntity` optional fiels to be nullable only
- TO DIG `never` occurences on settings, defaultValue etc
- Some interfaces will be replaced by the `FlatFieldMetadata` when
deprecating the current sync and comparators tools

packages/twenty-server/src/engine/workspace-manager/workspace-migration-builder/factories/utils/__tests__/workspace-migration-index.factory.util.spec.ts

@@ -2,17 +2,30 @@ import { FieldMetadataType } from 'twenty-shared/types';
 
 import { RelationType } from 'src/engine/metadata-modules/field-metadata/interfaces/relation-type.interface';
 
-import { FieldMetadataEntity } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
 import { IndexMetadataEntity } from 'src/engine/metadata-modules/index-metadata/index-metadata.entity';
 import { createIndexMigration } from 'src/engine/workspace-manager/workspace-migration-builder/factories/utils/workspace-migration-index.factory.utils';
+import { getMockFieldMetadataEntity } from 'src/utils/__test__/get-field-metadata-entity.mock';
 
 describe('WorkspaceMigrationIndexFactory', () => {
   it('should create index migrations for simple fields', async () => {
+    const simpleField = getMockFieldMetadataEntity({
+      workspaceId: '20202020-0000-0000-0000-000000000000',
+      objectMetadataId: '20202020-0000-0000-0000-000000000001',
+      id: 'f1',
+      type: FieldMetadataType.TEXT,
+      name: 'simpleField',
+      label: 'Simple Field',
+      isNullable: true,
+      isLabelSyncedWithName: true,
+      createdAt: new Date(),
+      updatedAt: new Date(),
+    });
+
     const objectMetadata = {
-      id: 'obj1',
-      workspaceId: 'ws1',
+      id: '20202020-0000-0000-0000-000000000002',
+      workspaceId: '20202020-0000-0000-0000-000000000000',
       nameSingular: 'Test',
-      fields: [{ id: 'f1', name: 'simpleField', type: FieldMetadataType.TEXT }],
+      fields: [simpleField],
       isCustom: false,
     };
     const indexMetadata = {
@@ -39,25 +52,28 @@ describe('WorkspaceMigrationIndexFactory', () => {
   });
 
   it('should create index migrations for relation fields', async () => {
-    const fieldMetadata: Pick<
-      FieldMetadataEntity<FieldMetadataType.RELATION>,
-      'id' | 'name' | 'type' | 'settings' | 'isCustom'
-    > = {
+    const relationField = getMockFieldMetadataEntity({
+      workspaceId: '20202020-0000-0000-0000-000000000000',
+      objectMetadataId: '20202020-0000-0000-0000-000000000001',
       id: 'f2',
-      name: 'author',
       type: FieldMetadataType.RELATION,
+      name: 'author',
+      label: 'Author',
+      isNullable: true,
+      isLabelSyncedWithName: true,
+      createdAt: new Date(),
+      updatedAt: new Date(),
       settings: {
         relationType: RelationType.MANY_TO_ONE,
         joinColumnName: 'authorId',
       },
-      isCustom: false,
-    };
+    });
 
     const objectMetadata = {
-      id: 'obj2',
-      workspaceId: 'ws1',
+      id: '20202020-0000-0000-0000-000000000003',
+      workspaceId: '20202020-0000-0000-0000-000000000000',
       nameSingular: 'Attachment',
-      fields: [fieldMetadata],
+      fields: [relationField],
       isCustom: false,
     };
     const indexMetadata = {