Remove old relations (#11993)

This is a first PR to remove old relation logic

Next steps:
- remove relationMetadata from cache
- remove relationMetadata table content and structure
- refactor relationDefinition to leverage field.settings instead

packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.module.ts

@@ -9,7 +9,6 @@ import { NestjsQueryTypeOrmModule } from '@ptc-org/nestjs-query-typeorm';
 
 import { TypeORMModule } from 'src/database/typeorm/typeorm.module';
 import { ActorModule } from 'src/engine/core-modules/actor/actor.module';
-import { FeatureFlagModule } from 'src/engine/core-modules/feature-flag/feature-flag.module';
 import { WorkspaceAuthGuard } from 'src/engine/guards/workspace-auth.guard';
 import { DataSourceModule } from 'src/engine/metadata-modules/data-source/data-source.module';
 import { FieldMetadataDTO } from 'src/engine/metadata-modules/field-metadata/dtos/field-metadata.dto';
@@ -49,7 +48,6 @@ import { UpdateFieldInput } from './dtos/update-field.input';
         WorkspaceMigrationRunnerModule,
         WorkspaceMetadataVersionModule,
         WorkspaceCacheStorageModule,
-        FeatureFlagModule,
         ObjectMetadataModule,
         DataSourceModule,
         TypeORMModule,