Slack/Mattermost slash commands
What does this MR do?
Add support for some slash commands, mattermost is supported out of the box it seems, also; using MM is way easier to test locally.
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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CHANGELOG entry added -
Documentation created/updated -
Link from the edit integration page
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API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master(if you do - rebase it please) -
Squashed related commits together