[MM-7968] restrict creation of direct channels to team members (#17222)

* restrict creation of direct channels to team members

* run make i18n-extract

* add suggestions from hahmadia

* place common-team-check logic in app layer

* use flat SQL query

* show more specific error message to user

* MM-7968: Fmt file.

* MM-7968: Fix for moved session field.

Co-authored-by: Max Erenberg <max.erenberg@mattermost.com>
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
Co-authored-by: Martin Kraft <martinkraft@gmail.com>
Co-authored-by: Martin Kraft <martin@upspin.org>

store/timerlayer/timerlayer.go

@@ -7271,6 +7271,22 @@ func (s *TimerLayerTeamStore) GetChannelUnreadsForTeam(teamID string, userID str
 	return result, err
 }
 
+func (s *TimerLayerTeamStore) GetCommonTeamIDsForTwoUsers(userID string, otherUserID string) ([]string, error) {
+	start := timemodule.Now()
+
+	result, err := s.TeamStore.GetCommonTeamIDsForTwoUsers(userID, otherUserID)
+
+	elapsed := float64(timemodule.Since(start)) / float64(timemodule.Second)
+	if s.Root.Metrics != nil {
+		success := "false"
+		if err == nil {
+			success = "true"
+		}
+		s.Root.Metrics.ObserveStoreMethodDuration("TeamStore.GetCommonTeamIDsForTwoUsers", success, elapsed)
+	}
+	return result, err
+}
+
 func (s *TimerLayerTeamStore) GetMember(ctx context.Context, teamID string, userID string) (*model.TeamMember, error) {
 	start := timemodule.Now()