Make the Issue Handling more granular

TL:DR, 'cancelled' states are now resolved, added ppg ok and accepted in the labellings, as well as change the close_issue to check_issue as the function's evolved beyond just closing

Stemmed from the issue:

This production issue has been open for a very long time now. lhcb-simulation/mc-requests#214 (closed)

Had a quick look and turns out its because they are either done, rejected, or cancelled.

We're missing the 'Cancelled' state in resolved_requests. This request fixes it, and hopefully allows this issue to be closed.

Also decided to introduce more granular notation, like PPG OK and Accepted :)