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/sso/workspace-sso-identity-provider.entity.ts

@@ -72,7 +72,7 @@ export class WorkspaceSSOIdentityProviderEntity {
   @JoinColumn({ name: 'workspaceId' })
   workspace: Relation<WorkspaceEntity>;
 
-  @Column()
+  @Column({ nullable: false, type: 'uuid' })
   workspaceId: string;
 
   @CreateDateColumn({ type: 'timestamptz' })