[MM-32622] Remove app.WaitForChannelMembership() (#17048)

* Remove app.WaitForChannelMembership

* Fix tests

* Fix test

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

store/retrylayer/retrylayer.go

@@ -1284,11 +1284,11 @@ func (s *RetryLayerChannelStore) GetGuestCount(channelID string, allowFromCache
 
 }
 
-func (s *RetryLayerChannelStore) GetMember(channelID string, userId string) (*model.ChannelMember, error) {
+func (s *RetryLayerChannelStore) GetMember(ctx context.Context, channelID string, userId string) (*model.ChannelMember, error) {
 
 	tries := 0
 	for {
-		result, err := s.ChannelStore.GetMember(channelID, userId)
+		result, err := s.ChannelStore.GetMember(ctx, channelID, userId)
 		if err == nil {
 			return result, nil
 		}
@@ -1330,11 +1330,11 @@ func (s *RetryLayerChannelStore) GetMemberCountFromCache(channelID string) int64
 
 }
 
-func (s *RetryLayerChannelStore) GetMemberCountsByGroup(channelID string, includeTimezones bool) ([]*model.ChannelMemberCountByGroup, error) {
+func (s *RetryLayerChannelStore) GetMemberCountsByGroup(ctx context.Context, channelID string, includeTimezones bool) ([]*model.ChannelMemberCountByGroup, error) {
 
 	tries := 0
 	for {
-		result, err := s.ChannelStore.GetMemberCountsByGroup(channelID, includeTimezones)
+		result, err := s.ChannelStore.GetMemberCountsByGroup(ctx, channelID, includeTimezones)
 		if err == nil {
 			return result, nil
 		}