Auth: Fix Last Seen being updated on every request (#72036)

* make sure LastSeen hook has information to decide if update is necessary

* make user service check if it should update the user's last seen

* do not run last seen hook if is a login request

* make service return error when last seen is up to date

* fix err

* Update pkg/services/contexthandler/contexthandler.go

Co-authored-by: Gabriel MABILLE <gamab@users.noreply.github.com>

* fix golint

---------

Co-authored-by: Gabriel MABILLE <gamab@users.noreply.github.com>

pkg/services/user/userimpl/user.go

@@ -219,9 +219,26 @@ func (s *Service) ChangePassword(ctx context.Context, cmd *user.ChangeUserPasswo
 }
 
 func (s *Service) UpdateLastSeenAt(ctx context.Context, cmd *user.UpdateUserLastSeenAtCommand) error {
+	u, err := s.GetSignedInUserWithCacheCtx(ctx, &user.GetSignedInUserQuery{
+		UserID: cmd.UserID,
+		OrgID:  cmd.OrgID,
+	})
+
+	if err != nil {
+		return err
+	}
+
+	if !shouldUpdateLastSeen(u.LastSeenAt) {
+		return user.ErrLastSeenUpToDate
+	}
+
 	return s.store.UpdateLastSeenAt(ctx, cmd)
 }
 
+func shouldUpdateLastSeen(t time.Time) bool {
+	return time.Since(t) > time.Minute*5
+}
+
 func (s *Service) SetUsingOrg(ctx context.Context, cmd *user.SetUsingOrgCommand) error {
 	getOrgsForUserCmd := &org.GetUserOrgListQuery{UserID: cmd.UserID}
 	orgsForUser, err := s.orgService.GetUserOrgList(ctx, getOrgsForUserCmd)