Refactor onboarding user vars to be absent when user is fully onboarded (#6531)

In this PR:
- take feedbacks from: https://github.com/twentyhq/twenty/pull/6530 /
https://github.com/twentyhq/twenty/pull/6529 /
https://github.com/twentyhq/twenty/pull/6526 /
https://github.com/twentyhq/twenty/pull/6512
- refactor onboarding uservars to be absent when the user is fully
onboarded: isStepComplete ==> isStepIncomplete
- introduce a new workspace.activationStatus: CREATION_ONGOING

I'm retesting the whole flow:
- with/without BILLING
- sign in with/without SSO
- sign up with/without SSO
- another workspaceMembers join the team
- subscriptionCanceled
- access to billingPortal

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

@@ -1,4 +1,4 @@
-import { Injectable } from '@nestjs/common';
+import { Injectable, Logger } from '@nestjs/common';
 
 import {
   QueryRunner,
@@ -32,6 +32,8 @@ import { customTableDefaultColumns } from './utils/custom-table-default-column.u
 
 @Injectable()
 export class WorkspaceMigrationRunnerService {
+  private readonly logger = new Logger(WorkspaceMigrationRunnerService.name);
+
   constructor(
     private readonly workspaceDataSourceService: WorkspaceDataSourceService,
     private readonly workspaceMigrationService: WorkspaceMigrationService,
@@ -87,7 +89,7 @@ export class WorkspaceMigrationRunnerService {
 
       await queryRunner.commitTransaction();
     } catch (error) {
-      console.error('Error executing migration', error);
+      this.logger.error('Error executing migration', error);
       await queryRunner.rollbackTransaction();
       throw error;
     } finally {