MM-55733 add request context to Channelstore.Save method (#26141)

server/channels/store/store.go

@@ -181,7 +181,7 @@ type TeamStore interface {
 }
 
 type ChannelStore interface {
-	Save(channel *model.Channel, maxChannelsPerTeam int64) (*model.Channel, error)
+	Save(rctx request.CTX, channel *model.Channel, maxChannelsPerTeam int64) (*model.Channel, error)
 	CreateDirectChannel(ctx request.CTX, userID *model.User, otherUserID *model.User, channelOptions ...model.ChannelOption) (*model.Channel, error)
 	SaveDirectChannel(ctx request.CTX, channel *model.Channel, member1 *model.ChannelMember, member2 *model.ChannelMember) (*model.Channel, error)
 	Update(ctx request.CTX, channel *model.Channel) (*model.Channel, error)