Explicitly set workspaceId column as uuid type to ease pg LEFT JOIN (#15430)

Pg scan was redundant because historically the workspaceId was
`varchar`, even though below migration won't change that we had a look
to workspaceId col declaration across the codebase

packages/twenty-server/src/engine/core-modules/approved-access-domain/approved-access-domain.entity.ts

@@ -37,7 +37,7 @@ export class ApprovedAccessDomainEntity {
   @Column({ type: 'boolean', default: false, nullable: false })
   isValidated: boolean;
 
-  @Column()
+  @Column({ nullable: false, type: 'uuid' })
   workspaceId: string;
 
   @ManyToOne(