fix(server): untracked thumbnail and preview images (#9126)

* delete old thumbnails

* add tests

* revert invisible asset handling

server/test/fixtures/asset.stub.ts

@@ -471,6 +471,24 @@ export const assetStub = {
     },
   } as AssetEntity),
 
+  liveMotionWithThumb: Object.freeze({
+    id: fileStub.livePhotoMotion.uuid,
+    originalPath: fileStub.livePhotoMotion.originalPath,
+    ownerId: authStub.user1.user.id,
+    type: AssetType.VIDEO,
+    isVisible: false,
+    fileModifiedAt: new Date('2022-06-19T23:41:36.910Z'),
+    fileCreatedAt: new Date('2022-06-19T23:41:36.910Z'),
+    libraryId: 'library-id',
+    library: libraryStub.uploadLibrary1,
+    previewPath: '/uploads/user-id/thumbs/path.ext',
+    thumbnailPath: '/uploads/user-id/webp/path.ext',
+    exifInfo: {
+      fileSizeInByte: 100_000,
+      timeZone: `America/New_York`,
+    },
+  } as AssetEntity),
+
   livePhotoStillAsset: Object.freeze({
     id: 'live-photo-still-asset',
     originalPath: fileStub.livePhotoStill.originalPath,