Adds support for GMs in shared channels (#31403)

* Adds support for GMs in shared channels

* Fix linter

* Remove creatorID from slack call

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Co-authored-by: Miguel de la Cruz <miguel@ctrlz.es>

server/channels/store/searchlayer/channel_layer.go

@@ -66,8 +66,8 @@ func (c *SearchChannelStore) indexChannel(rctx request.CTX, channel *model.Chann
 	}
 }
 
-func (c *SearchChannelStore) Save(rctx request.CTX, channel *model.Channel, maxChannels int64) (*model.Channel, error) {
-	newChannel, err := c.ChannelStore.Save(rctx, channel, maxChannels)
+func (c *SearchChannelStore) Save(rctx request.CTX, channel *model.Channel, maxChannels int64, channelOptions ...model.ChannelOption) (*model.Channel, error) {
+	newChannel, err := c.ChannelStore.Save(rctx, channel, maxChannels, channelOptions...)
 	if err == nil {
 		c.indexChannel(rctx, newChannel)
 	}