Automatically clean up soft-deleted records after X days. (#14862)

Closes #14726

### Added
- `trashRetentionDays` field to workspace entity (default: 14 days)  
- Automated trash cleanup using BullMQ jobs  
- Daily cron (00:10 UTC) that enqueues cleanup jobs for all active
workspaces
- Per-workspace limit: 100k records deleted per day  
- Calendar-based retention: records deleted on day X are cleaned up X+14
days later (at midnight UTC boundaries)

### Architecture
- **Cron (WorkspaceTrashCleanupCronJob):** Runs daily, enqueues jobs in
parallel for all workspaces
- **Job (WorkspaceTrashCleanupJob):** Processes individual workspace
cleanup
- **Service (WorkspaceTrashCleanupService):** Discovers tables with
`deletedAt`, deletes old records with quota enforcement
- **Command:** `npx nx run twenty-server:command
cron:workspace:cleanup-trash` to register the cron

### Testing
- Unit tests for service with 100% coverage of public API  
- Tested quota enforcement, error handling, and edge cases

---------

Co-authored-by: Félix Malfait <felix.malfait@gmail.com>

packages/twenty-front/src/testing/mock-data/users.ts

@@ -84,6 +84,7 @@ export const mockCurrentWorkspace: Workspace = {
   createdAt: '2023-04-26T10:23:42.33625+00:00',
   updatedAt: '2023-04-26T10:23:42.33625+00:00',
   metadataVersion: 1,
+  trashRetentionDays: 14,
   currentBillingSubscription: {
     __typename: 'BillingSubscription',
     id: '7efbc3f7-6e5e-4128-957e-8d86808cdf6a',
@@ -151,6 +152,7 @@ export const mockCurrentWorkspace: Workspace = {
   databaseSchema: '',
   databaseUrl: '',
   isTwoFactorAuthenticationEnforced: false,
+  __typename: 'Workspace',
 };
 
 export const mockedWorkspaceMemberData: WorkspaceMember = {