bug(testbot): "all checks passed" but open tests

[srl295]

playground repro: keymanapp/keymanapp-test-bot-playground#14 (comment)

Production repro: keymanapp/keyman#11172 (comment)

Repro steps:

1. create PR with @keymanapp-test-bot skip
2. later, remove the skip and add a test suite in a comment

unclear if an intermediate half-baked test suite in the description (in addition to the comment) is needed.

[mcdurdin]

It appears that if the text @keymanapp-test-bot skip is found anywhere in any comment in the PR, then the checks 'pass', although the labels show the actual state correctly.

I removed the @ from two comments (1, 2) in keymanapp/keyman#11172 and then status of checks was shown correctly.

[mcdurdin]

Will fix after beta release