Remove typeorm service (#14116)

## Context
To simplify the way we inject our default datasource, I've recently
removed the token injection that was confusion since we only had once
configured on the module level. Now I'm removing TypeORM service which
allows us to instantiate a new Datasource with the same parameters as
the default one, it was redundant and confusing.

packages/twenty-server/src/engine/workspace-manager/workspace-manager.service.ts

@@ -17,6 +17,7 @@ import { RoleEntity } from 'src/engine/metadata-modules/role/role.entity';
 import { RoleService } from 'src/engine/metadata-modules/role/role.service';
 import { UserRoleService } from 'src/engine/metadata-modules/user-role/user-role.service';
 import { WorkspaceMigrationService } from 'src/engine/metadata-modules/workspace-migration/workspace-migration.service';
+import { TwentyORMGlobalManager } from 'src/engine/twenty-orm/twenty-orm-global.manager';
 import { WorkspaceDataSourceService } from 'src/engine/workspace-datasource/workspace-datasource.service';
 import { prefillCoreViews } from 'src/engine/workspace-manager/standard-objects-prefill-data/prefill-core-views';
 import { standardObjectsPrefillData } from 'src/engine/workspace-manager/standard-objects-prefill-data/standard-objects-prefill-data';
@@ -47,6 +48,7 @@ export class WorkspaceManagerService {
     @InjectRepository(RoleTargetsEntity)
     private readonly roleTargetsRepository: Repository<RoleTargetsEntity>,
     private readonly agentService: AgentService,
+    protected readonly twentyORMGlobalManager: TwentyORMGlobalManager,
   ) {}
 
   public async init({
@@ -123,18 +125,16 @@ export class WorkspaceManagerService {
     workspaceId: string,
     featureFlags: Record<string, boolean>,
   ) {
-    const mainDataSource =
-      await this.workspaceDataSourceService.connectToMainDataSource();
-
-    if (!mainDataSource) {
-      throw new Error('Could not connect to main data source');
-    }
+    const workspaceDataSource =
+      await this.twentyORMGlobalManager.getDataSourceForWorkspace({
+        workspaceId,
+      });
 
     const createdObjectMetadata =
       await this.objectMetadataService.findManyWithinWorkspace(workspaceId);
 
     await standardObjectsPrefillData(
-      mainDataSource,
+      workspaceDataSource,
       dataSourceMetadata.schema,
       createdObjectMetadata,
       featureFlags,
@@ -144,7 +144,7 @@ export class WorkspaceManagerService {
       this.logger.log(`Prefilling core views for workspace ${workspaceId}`);
 
       await prefillCoreViews(
-        mainDataSource,
+        workspaceDataSource,
         workspaceId,
         createdObjectMetadata,
         featureFlags,