Automatically remove "awaiting response" label on-comment

[mitchhentges]

Also will close tickets that have been "awaiting response" for over 15 days.

[mitchhentges]

I have about 80% confidence that this is set up correctly:

• Is ${{ github.token }} automatically filled in? Sounds like it, but unsure
• Will this behave properly since the awaiting response label already exists?
• v0.5.0 👀
• I can't test auto-ticket closures in a fork

However, perusing through the active tickets in the no-response repo doesn't show anything too concerning, and the main benefit is that awaiting response labels will be auto-cleared on-response, which will make it easier to ensure that issues/PRs don't fall through the cracks, while we also don't waste time checking incomplete PRs/issues.

TL;DR: the failure case if this doesn't work is likely that this change will essentially be a no-op. I'm feeling lucky, though I trust your judgement Sylvestre.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 34.72%. Comparing base (18ead2f) to head (cd5a02f).
⚠️ Report is 1027 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1129      +/-   ##
==========================================
+ Coverage   34.65%   34.72%   +0.06%     
==========================================
  Files          47       47              
  Lines       12638    12638              
  Branches     6589     6589              
==========================================
+ Hits         4380     4388       +8     
+ Misses       4012     4011       -1     
+ Partials     4246     4239       -7     

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[mitchhentges]

This codecov report is reducing my trust in the tool, because I have no Rust code here.
I wonder if it's comparing my branch to mozilla/sccache:main rather than rebasing and comparing my commits that are part of this PR.

[jschwe]

This codecov report is reducing my trust in the tool, because I have no Rust code here.

I don't know too much about codecov, but we probably anyway want to switch to -Zinstrument-coverage, since that is on track to be stabilized in 1.60, while the -Zprofile option probably will never be stabilized. instrument-coverage should AFAIK be more accurate.