refacto(*): remove everything about default workspace (#9157)

## Summary
- [x] Remove defaultWorkspace in user
- [x] Remove all occurrence of defaultWorkspace and defaultWorkspaceId
- [x] Improve activate workspace flow
- [x] Improve security on social login
- [x] Add `ImpersonateGuard`
- [x] Allow to use impersonation with couple `User/Workspace`
- [x] Prevent unexpected reload on activate workspace
- [x] Scope login token with workspaceId 

Fix https://github.com/twentyhq/twenty/issues/9033#event-15714863042

packages/twenty-server/src/engine/guards/impersonate-guard.ts

@@ -0,0 +1,15 @@
+import { CanActivate, ExecutionContext } from '@nestjs/common';
+import { GqlExecutionContext } from '@nestjs/graphql';
+
+import { Observable } from 'rxjs';
+
+export class ImpersonateGuard implements CanActivate {
+  canActivate(
+    context: ExecutionContext,
+  ): boolean | Promise<boolean> | Observable<boolean> {
+    const ctx = GqlExecutionContext.create(context);
+    const request = ctx.getContext().req;
+
+    return request.user.canImpersonate === true;
+  }
+}