feat: manually implement joinColumn (#6022)

This PR introduce a new decorator named `@WorkspaceJoinColumn`, the goal
of this one is to manually declare the join columns inside the workspace
entities, so we don't have to rely on `ObjectRecord` type.

This decorator can be used that way:

```typescript
  @WorkspaceRelation({
    standardId: ACTIVITY_TARGET_STANDARD_FIELD_IDS.company,
    type: RelationMetadataType.MANY_TO_ONE,
    label: 'Company',
    description: 'ActivityTarget company',
    icon: 'IconBuildingSkyscraper',
    inverseSideTarget: () => CompanyWorkspaceEntity,
    inverseSideFieldKey: 'activityTargets',
  })
  @WorkspaceIsNullable()
  company: Relation<CompanyWorkspaceEntity> | null;

  // The argument is the name of the relation above
  @WorkspaceJoinColumn('company')
  companyId: string | null;
```

packages/twenty-server/src/modules/person/repositories/person.repository.ts

@@ -3,7 +3,6 @@ import { Injectable } from '@nestjs/common';
 import { EntityManager } from 'typeorm';
 
 import { WorkspaceDataSourceService } from 'src/engine/workspace-datasource/workspace-datasource.service';
-import { ObjectRecord } from 'src/engine/workspace-manager/workspace-sync-metadata/types/object-record';
 import { PersonWorkspaceEntity } from 'src/modules/person/standard-objects/person.workspace-entity';
 import { getFlattenedValuesAndValuesStringForBatchRawQuery } from 'src/modules/calendar/utils/get-flattened-values-and-values-string-for-batch-raw-query.util';
 
@@ -17,7 +16,7 @@ export class PersonRepository {
     emails: string[],
     workspaceId: string,
     transactionManager?: EntityManager,
-  ): Promise<ObjectRecord<PersonWorkspaceEntity>[]> {
+  ): Promise<PersonWorkspaceEntity[]> {
     const dataSourceSchema =
       this.workspaceDataSourceService.getSchemaName(workspaceId);
 
@@ -56,7 +55,7 @@ export class PersonRepository {
     }[],
     workspaceId: string,
     transactionManager?: EntityManager,
-  ): Promise<ObjectRecord<PersonWorkspaceEntity>[]> {
+  ): Promise<PersonWorkspaceEntity[]> {
     const dataSourceSchema =
       this.workspaceDataSourceService.getSchemaName(workspaceId);