mattermost slash command double posts with mattermost notification integration

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Summary

When connecting a repo to a mattermost chatops style, it's quite common to enable both: a slash command and a notification integration. The first allows to "interact/write" (create and list issues...) from chat, the second allows to "read" (notify a channel about changes in the repo).

The annoying thing now happens when a user uses the slash command in the same channel as the notifications are dropped into, as you basically read everything twice: once from the slash command bot, once from the notification bot.

Possible fixes

It would be awesome if one could silence the replies from the slash command (or make them private).