[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/store.go

@@ -234,7 +234,7 @@ type ChannelStore interface {
 	IsUserInChannelUseCache(userID string, channelID string) bool
 	GetAllChannelMembersNotifyPropsForChannel(channelID string, allowFromCache bool) (map[string]model.StringMap, error)
 	InvalidateCacheForChannelMembersNotifyProps(channelID string)
-	GetMemberForPost(postID string, userID string) (*model.ChannelMember, error)
+	GetMemberForPost(postID string, userID string, includeArchivedChannels bool) (*model.ChannelMember, error)
 	InvalidateMemberCount(channelID string)
 	GetMemberCountFromCache(channelID string) int64
 	GetFileCount(channelID string) (int64, error)