chore(server): Store generated files (thumbnails, encoded video) in subdirectories (#4112)

* save thumbnails in subdirectories

* migration job, migrate assets and face thumbnails

* fix tests

* directory depth of two instead of three

* cleanup empty dirs after migration

* clean up empty dirs after migration, migrate people without assetId

* add job card for new migration job

* fix removeEmptyDirs race condition because of missing await

* cleanup empty directories after asset deletion

* move ensurePath to storage core

* rename jobs

* remove unnecessary property of IEntityJob

* use updated person getById, minor refactoring

* ensure that directory cleanup doesn't interfere with migration

* better description for job in ui

* fix remove directories when migration is done

* cleanup empty folders at start of migration

* fix: actually persist concurrency setting

* add comment explaining regex

* chore: cleanup

---------

Co-authored-by: Jason Rasmussen <jrasm91@gmail.com>

server/src/domain/user/user.service.ts

@@ -25,8 +25,8 @@ import { IUserRepository } from './user.repository';
 @Injectable()
 export class UserService {
   private logger = new Logger(UserService.name);
+  private storageCore: StorageCore;
   private userCore: UserCore;
-  private storageCore = new StorageCore();
 
   constructor(
     @Inject(IUserRepository) private userRepository: IUserRepository,
@@ -37,6 +37,7 @@ export class UserService {
     @Inject(IJobRepository) private jobRepository: IJobRepository,
     @Inject(IStorageRepository) private storageRepository: IStorageRepository,
   ) {
+    this.storageCore = new StorageCore(storageRepository);
     this.userCore = new UserCore(userRepository, libraryRepository, cryptoRepository);
   }