fix(server): external library motion photo video asset handling (#8721)

* added "isExternal" to the getLibraryAssetPaths query

* handleQueueAssetRefresh skip "non external" video asset, closes #8562

* correctly implements live photo deletion for external library

* use "external asset" for external library tests

* minor: external library asset checksum is "path hash" not file hash

* renamed to getExternalLibraryAssetPaths and added isExternal where clause

* generated sql

* reverted leftover change

server/src/services/library.service.ts

@@ -616,7 +616,7 @@ export class LibraryService extends EventEmitter {
     const assetIdsToMarkOffline = [];
     const assetIdsToMarkOnline = [];
     const pagination = usePagination(LIBRARY_SCAN_BATCH_SIZE, (pagination) =>
-      this.assetRepository.getLibraryAssetPaths(pagination, library.id),
+      this.assetRepository.getExternalLibraryAssetPaths(pagination, library.id),
     );
 
     this.logger.verbose(`Crawled asset paths paginated`);