Compile with swc on twenty-server (#4863)

Experiment using swc instead of tsc (as we did the switch on
twenty-front)

It's **much** faster (at least 5x) but has stricter requirements.
I fixed the build but there's still an error while starting the server,
opening this PR for discussion.

Checkout the branch and try `nx build:swc twenty-server`

Read: https://docs.nestjs.com/recipes/swc#common-pitfalls

packages/twenty-server/src/engine/core-modules/feature-flag/feature-flag.entity.ts

@@ -8,6 +8,7 @@ import {
   CreateDateColumn,
   UpdateDateColumn,
   ManyToOne,
+  Relation,
 } from 'typeorm';
 import { IDField } from '@ptc-org/nestjs-query-graphql';
 
@@ -43,7 +44,7 @@ export class FeatureFlagEntity {
   @ManyToOne(() => Workspace, (workspace) => workspace.featureFlags, {
     onDelete: 'CASCADE',
   })
-  workspace: Workspace;
+  workspace: Relation<Workspace>;
 
   @Field()
   @Column({ nullable: false })