[MM-56174] Account for archived channels in channel member for post permission check (#25837)

* [MM-56174] Account for archived channels in channel member for post permission check

* Add tests

server/channels/store/timerlayer/timerlayer.go

@@ -1445,10 +1445,10 @@ func (s *TimerLayerChannelStore) GetMemberCountsByGroup(ctx context.Context, cha
 	return result, err
 }
 
-func (s *TimerLayerChannelStore) GetMemberForPost(postID string, userID string) (*model.ChannelMember, error) {
+func (s *TimerLayerChannelStore) GetMemberForPost(postID string, userID string, includeArchivedChannels bool) (*model.ChannelMember, error) {
 	start := time.Now()
 
-	result, err := s.ChannelStore.GetMemberForPost(postID, userID)
+	result, err := s.ChannelStore.GetMemberForPost(postID, userID, includeArchivedChannels)
 
 	elapsed := float64(time.Since(start)) / float64(time.Second)
 	if s.Root.Metrics != nil {