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/generated/graphql.ts

@@ -4077,6 +4077,7 @@ export type UpdateWorkspaceInput = {
   isTwoFactorAuthenticationEnforced?: InputMaybe<Scalars['Boolean']>;
   logo?: InputMaybe<Scalars['String']>;
   subdomain?: InputMaybe<Scalars['String']>;
+  trashRetentionDays?: InputMaybe<Scalars['Float']>;
 };
 
 export type UpsertFieldPermissionsInput = {
@@ -4362,6 +4363,7 @@ export type Workspace = {
   logo?: Maybe<Scalars['String']>;
   metadataVersion: Scalars['Float'];
   subdomain: Scalars['String'];
+  trashRetentionDays: Scalars['Float'];
   updatedAt: Scalars['DateTime'];
   version?: Maybe<Scalars['String']>;
   viewFields?: Maybe<Array<CoreViewField>>;