One-line/X character limit display option for Issues and comments notifications in a Mattermost channel

[joemcl]

We're using this integration, and thanks so much for it! A request: we'd like to limit the length of a notification in a Mattermost channel of a new GitLab Issue or Comment on an existing issue to one line and/or X characters. We have a Channel for a GitLab project, and a webhook to feed notifications to that channel, but folks want to minimize the length of the text that appears - so if someone writes a lengthy Issue description or comment, it won't all appear, but instead only the first line/X characters, with a link to the entire Issue/comment on the GitLab project page. Any help appreciated. Thanks!