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/timerlayer/timerlayer.go

@@ -550,10 +550,10 @@ func (s *TimerLayerChannelStore) AnalyticsTypeCount(teamID string, channelType m
 	return result, err
 }
 
-func (s *TimerLayerChannelStore) Autocomplete(userID string, term string, includeDeleted bool) (model.ChannelListWithTeamData, error) {
+func (s *TimerLayerChannelStore) Autocomplete(userID string, term string, includeDeleted bool, isGuest bool) (model.ChannelListWithTeamData, error) {
 	start := timemodule.Now()
 
-	result, err := s.ChannelStore.Autocomplete(userID, term, includeDeleted)
+	result, err := s.ChannelStore.Autocomplete(userID, term, includeDeleted, isGuest)
 
 	elapsed := float64(timemodule.Since(start)) / float64(timemodule.Second)
 	if s.Root.Metrics != nil {
@@ -566,10 +566,10 @@ func (s *TimerLayerChannelStore) Autocomplete(userID string, term string, includ
 	return result, err
 }
 
-func (s *TimerLayerChannelStore) AutocompleteInTeam(teamID string, userID string, term string, includeDeleted bool) (model.ChannelList, error) {
+func (s *TimerLayerChannelStore) AutocompleteInTeam(teamID string, userID string, term string, includeDeleted bool, isGuest bool) (model.ChannelList, error) {
 	start := timemodule.Now()
 
-	result, err := s.ChannelStore.AutocompleteInTeam(teamID, userID, term, includeDeleted)
+	result, err := s.ChannelStore.AutocompleteInTeam(teamID, userID, term, includeDeleted, isGuest)
 
 	elapsed := float64(timemodule.Since(start)) / float64(timemodule.Second)
 	if s.Root.Metrics != nil {