MM-54778 Fix mark as unread on GMs (#24880)

* Fix mark as unread on GMs

* Don't count own messages in gms when marking as unread

* Change argument name

* Rename userId

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/store/retrylayer/retrylayer.go

@@ -808,11 +808,11 @@ func (s *RetryLayerChannelStore) ClearSidebarOnTeamLeave(userID string, teamID s
 
 }
 
-func (s *RetryLayerChannelStore) CountPostsAfter(channelID string, timestamp int64, userID string) (int, int, error) {
+func (s *RetryLayerChannelStore) CountPostsAfter(channelID string, timestamp int64, excludedUserID string) (int, int, error) {
 
 	tries := 0
 	for {
-		result, resultVar1, err := s.ChannelStore.CountPostsAfter(channelID, timestamp, userID)
+		result, resultVar1, err := s.ChannelStore.CountPostsAfter(channelID, timestamp, excludedUserID)
 		if err == nil {
 			return result, resultVar1, nil
 		}
@@ -829,11 +829,11 @@ func (s *RetryLayerChannelStore) CountPostsAfter(channelID string, timestamp int
 
 }
 
-func (s *RetryLayerChannelStore) CountUrgentPostsAfter(channelID string, timestamp int64, userID string) (int, error) {
+func (s *RetryLayerChannelStore) CountUrgentPostsAfter(channelID string, timestamp int64, excludedUserID string) (int, error) {
 
 	tries := 0
 	for {
-		result, err := s.ChannelStore.CountUrgentPostsAfter(channelID, timestamp, userID)
+		result, err := s.ChannelStore.CountUrgentPostsAfter(channelID, timestamp, excludedUserID)
 		if err == nil {
 			return result, nil
 		}