Add version ping for Mattermost Usage
We should track the usage of Mattermost as part of our usage pings, this would allow us to track and understand usage across our customer base and versions.
We should track the number of projects with Mattermost enabled on a given server. One counter for each type of integration. (Slash commands and notifications) Since we also have general host information, we can then derive a few key stats on usage.
- How many hosts have MM integration enabled
- How many projects have MM, and what % that is (I believe we also track total # of projects)
- Total projects with MM integration