lfs/lock: round locked_at timestamp to second (#7872)

* lfs/lock: round locked_at timestamp to second

* test returned locked_at values

* tests: use time RFC3339

integrations/api_repo_lfs_locks_test.go

 		req := NewRequestWithJSON(t, "POST", fmt.Sprintf("/%s.git/info/lfs/locks", test.repo.FullName()), map[string]string{"path": test.path})
 		req.Header.Set("Accept", "application/vnd.git-lfs+json")
 		req.Header.Set("Content-Type", "application/vnd.git-lfs+json")
-		session.MakeRequest(t, req, test.httpResult)
+		resp := session.MakeRequest(t, req, test.httpResult)
 		if len(test.addTime) > 0 {
+			var lfsLock api.LFSLockResponse
+			DecodeJSON(t, resp, &lfsLock)
+			assert.EqualValues(t, lfsLock.Lock.LockedAt.Format(time.RFC3339), lfsLock.Lock.LockedAt.Format(time.RFC3339Nano)) //locked at should be rounded to second
 			for _, id := range test.addTime {
 				resultsTests[id].locksTimes = append(resultsTests[id].locksTimes, time.Now())
 			}
 		for i, lock := range lfsLocks.Locks {
 			assert.EqualValues(t, test.locksOwners[i].DisplayName(), lock.Owner.Name)
 			assert.WithinDuration(t, test.locksTimes[i], lock.LockedAt, 3*time.Second)
+			assert.EqualValues(t, lock.LockedAt.Format(time.RFC3339), lock.LockedAt.Format(time.RFC3339Nano)) //locked at should be rounded to second
 		}
 
 		req = NewRequestWithJSON(t, "POST", fmt.Sprintf("/%s.git/info/lfs/locks/verify", test.repo.FullName()), map[string]string{})

models/lfs_lock.go

 	return &api.LFSLock{
 		ID:       strconv.FormatInt(l.ID, 10),
 		Path:     l.Path,
-		LockedAt: l.Created,
+		LockedAt: l.Created.Round(time.Second),
 		Owner: &api.LFSLockOwner{
 			Name: l.Owner.DisplayName(),
 		},