Add exempt as bypass mode to ruleset bypass actors

[claystation]

Fixes #3714

[gmlewis]

Thank you, @claystation!
One minor tweak, please, otherwise LGTM.

Note that I still don't have write access to this repo, but figure I might as well attempt to catch up on my code reviews (which I usually allow the linter to process first... ah, well).

[claystation]

@gmlewis no rush. Hope you get access back soon enough!

[gmlewis]

Thank you, @claystation!
LGTM.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.08%. Comparing base (f137c94) to head (484d81c).
⚠️ Report is 9 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3719   +/-   ##
=======================================
  Coverage   91.08%   91.08%           
=======================================
  Files         187      187           
  Lines       16581    16581           
=======================================
  Hits        15103    15103           
  Misses       1293     1293           
  Partials      185      185           

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