Mark category as read (#24003)

* Mark category as read

* Fix lint and test

* Fix tests

* Fix test and remove wrong aria

* Address server issues and add mark as read for unreads

* Missing changes

* Fix tests

* fix tests

* Add confirmation popup to mark as read category

* Always use viewMultipleChannels and other fixes

* Remove unneeded code

* Fix test

* Address feedback

* Address feedback

* Fix tests

* Fix test

* Fix tests

* Update aria-haspopup depending on the number of channels to mark as viewed

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Co-authored-by: Mattermost Build <build@mattermost.com>

server/public/model/websocket_message.go

@@ -48,6 +48,7 @@ const (
 	WebsocketEventResponse                            = "response"
 	WebsocketEventEmojiAdded                          = "emoji_added"
 	WebsocketEventChannelViewed                       = "channel_viewed"
+	WebsocketEventMultipleChannelsViewed              = "multiple_channels_viewed"
 	WebsocketEventPluginStatusesChanged               = "plugin_statuses_changed"
 	WebsocketEventPluginEnabled                       = "plugin_enabled"
 	WebsocketEventPluginDisabled                      = "plugin_disabled"