feat: improve performance for GET /api/album & /api/album/:id (#17124)

* fix(server) optimize number of sql calls for GET /api/albums

remove unnecessary join for getMetadataForIds
remove separate call to getLastUpdatedAssetForAlbumId

* fix(server) remove unnecessary getLastUpdatedAssetForAlbumId call for GET /api/album/:id

also remove getLastUpdatedAssetForAlbumId query as it is no longer referenced

* fix(server): correct lastModifiedAssetTimestamp return type + formatting and typing

* chore(server): address type issue with tests found via npm:check

tests & lint still pass before this commit.

server/test/repositories/asset.repository.mock.ts

@@ -21,7 +21,6 @@ export const newAssetRepositoryMock = (): Mocked<RepositoryInterface<AssetReposi
     getByChecksums: vitest.fn(),
     getUploadAssetIdByChecksum: vitest.fn(),
     getRandom: vitest.fn(),
-    getLastUpdatedAssetForAlbumId: vitest.fn(),
     getAll: vitest.fn().mockResolvedValue({ items: [], hasNextPage: false }),
     getAllByDeviceId: vitest.fn(),
     getLivePhotoCount: vitest.fn(),