[tests] rebased refactoring of acceptance test mocks GitOrigin-RevId: dd8b7d69c507aa1270b6fb165b1339bc8a7d6415
[misc] joinProject: hide deletedAt field in public deletedDocs array GitOrigin-RevId: 0ee11c2a8222304d5d1c4edafa2105b7ad43d5d8