sazzad hossain

Send ephemeral message when a mentioned user is not a member of the team

8

#### Summary This PR added a feature to send ephemeral message when a mentioned user is not a member of the team. Previously It was sent only for non channel...

Add display-name for experimental default channel

7

#### Summary Fixed missing display name issue for experimental default channel #### Ticket Link Fixes https://github.com/mattermost/mattermost/issues/24644 Jira https://mattermost.atlassian.net/browse/MM-53703 #### Screenshots **Before** **After** #### Release Note ```release-note NONE ```

MM-56629 Render Markdown in batched email notifications

4

#### Summary Added Markdown support for batched email notifications. #### Ticket Link Fixes https://github.com/mattermost/mattermost/issues/26116 Jira https://mattermost.atlassian.net/browse/MM-56629 #### Screenshots | before | after | |----|----| | | | #### Release Note...