fix(server): mail test & retry (#15044)

#### PR Dependency Tree


* **PR #15044** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

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## Summary by CodeRabbit

* **Bug Fixes**
* Stop sending notifications to disabled users; skip member invites when
workspace names contain URLs/domains
* Improve mail retry handling (per-recipient exhaustion, expiry, and
cache cleanup)
  * Make many email headers/lead lines more generic and consistent
  * Fail-safe workspace content parsing to avoid crashes

* **New Features**
* 24-hour signup protection for sharing, invites, and invite-link
creation
  * Job-queue: remove jobs by payload predicate

* **Tests**
* Expanded tests for mail jobs, SMTP hostname handling, payment
checkout, job-queue removal, and abuse-detection utilities
  * Updated test fixtures to set createdAt timestamps for new users

* **Chores**
  * Added required name input for test-email mutation
  * Database flush retry with deadlock detection/backoff

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packages/backend/server/src/__tests__/mocks/queue.mock.ts

@@ -6,6 +6,7 @@ import { JobQueue } from '../../base';
 export class MockJobQueue {
   add = Sinon.createStubInstance(JobQueue).add.resolves();
   remove = Sinon.createStubInstance(JobQueue).remove.resolves();
+  removeWhere = Sinon.createStubInstance(JobQueue).removeWhere.resolves([]);
 
   last<Job extends JobName>(name: Job): { name: Job; payload: Jobs[Job] } {
     const addJobName = this.add.lastCall?.args[0];

packages/backend/server/src/__tests__/mocks/user.mock.ts

@@ -19,6 +19,7 @@ export class MockUser extends Mocker<MockUserInput, MockedUser> {
     const password = input?.password ?? faker.internet.password();
     const user = await this.db.user.create({
       data: {
+        createdAt: new Date(Date.now() - 25 * 60 * 60 * 1000),
         email: faker.internet.email(),
         name: faker.person.fullName(),
         password: password ? hashSync(password) : undefined,