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/microservices/processors/metadata-extraction.processor.ts

@@ -50,7 +50,7 @@ const validate = <T>(value: T): T | null => (typeof value === 'string' ? null :
 export class MetadataExtractionProcessor {
   private logger = new Logger(MetadataExtractionProcessor.name);
   private reverseGeocodingEnabled: boolean;
-  private storageCore = new StorageCore();
+  private storageCore: StorageCore;
 
   constructor(
     @Inject(IAssetRepository) private assetRepository: IAssetRepository,
@@ -63,6 +63,7 @@ export class MetadataExtractionProcessor {
     configService: ConfigService,
   ) {
     this.reverseGeocodingEnabled = !configService.get('DISABLE_REVERSE_GEOCODING');
+    this.storageCore = new StorageCore(storageRepository);
   }
 
   async init(deleteCache = false) {