MM-45120: Track team join times. Add API to retrieve new team members since a given time. (#20708)

* MM-45120: Starts tracking team join time. Adds API to retrieve team members who joined after a given time.

* MM-45120: Updates json casing to match model.User.

store/retrylayer/retrylayer.go

@@ -10241,6 +10241,27 @@ func (s *RetryLayerTeamStore) GetMembersByIds(teamID string, userIds []string, r
 
 }
 
+func (s *RetryLayerTeamStore) GetNewTeamMembersSince(teamID string, since int64, offset int, limit int) (*model.NewTeamMembersList, int64, error) {
+
+	tries := 0
+	for {
+		result, resultVar1, err := s.TeamStore.GetNewTeamMembersSince(teamID, since, offset, limit)
+		if err == nil {
+			return result, resultVar1, nil
+		}
+		if !isRepeatableError(err) {
+			return result, resultVar1, err
+		}
+		tries++
+		if tries >= 3 {
+			err = errors.Wrap(err, "giving up after 3 consecutive repeatable transaction failures")
+			return result, resultVar1, err
+		}
+		timepkg.Sleep(100 * timepkg.Millisecond)
+	}
+
+}
+
 func (s *RetryLayerTeamStore) GetTeamMembersForExport(userID string) ([]*model.TeamMemberForExport, error) {
 
 	tries := 0