[MM-59361] custom groups & read only channels (#28892)

* added group mention, read only view and post event tracking

---------

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

webapp/channels/src/packages/mattermost-redux/src/constants/telemetry.ts

@@ -10,7 +10,7 @@ export const TrackGroupsFeature = 'custom_groups';
 export const TrackPassiveKeywordsFeature = 'passive_keywords';
 
 // Events
-export const TrackInviteGroupEvent = 'invite_group_to_channel';
+export const TrackInviteGroupEvent = 'invite_group_to_channel__add_member';
 export const TrackPassiveKeywordsEvent = 'update_passive_keywords';
 
 // Categories