store: guests will only receive results of which channels they are in (#20295)

* store: guests will only receive results of which channels they are in

* api4/channel_test: add test case for guest accounts channel autocomplete

* apply to searchengine and also for AutocompleteInTeam

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

store/retrylayer/retrylayer.go

@@ -619,11 +619,11 @@ func (s *RetryLayerChannelStore) AnalyticsTypeCount(teamID string, channelType m
 
 }
 
-func (s *RetryLayerChannelStore) Autocomplete(userID string, term string, includeDeleted bool) (model.ChannelListWithTeamData, error) {
+func (s *RetryLayerChannelStore) Autocomplete(userID string, term string, includeDeleted bool, isGuest bool) (model.ChannelListWithTeamData, error) {
 
 	tries := 0
 	for {
-		result, err := s.ChannelStore.Autocomplete(userID, term, includeDeleted)
+		result, err := s.ChannelStore.Autocomplete(userID, term, includeDeleted, isGuest)
 		if err == nil {
 			return result, nil
 		}
@@ -640,11 +640,11 @@ func (s *RetryLayerChannelStore) Autocomplete(userID string, term string, includ
 
 }
 
-func (s *RetryLayerChannelStore) AutocompleteInTeam(teamID string, userID string, term string, includeDeleted bool) (model.ChannelList, error) {
+func (s *RetryLayerChannelStore) AutocompleteInTeam(teamID string, userID string, term string, includeDeleted bool, isGuest bool) (model.ChannelList, error) {
 
 	tries := 0
 	for {
-		result, err := s.ChannelStore.AutocompleteInTeam(teamID, userID, term, includeDeleted)
+		result, err := s.ChannelStore.AutocompleteInTeam(teamID, userID, term, includeDeleted, isGuest)
 		if err == nil {
 			return result, nil
 		}