add webhook failure/redelivery statistics

[matt-codecov]

• creates a counter for all webhooks (from github) that failed to be delivered, broken down by webhook event
• creates a counter for webhook redelivery requests (to github), broken down by whether the request succeeded or not
• reorganizes some logic to make the relationship between the filters and metrics clearer

ideally the redelivery counter would also have an event label, and both counters could have a label for the event. but i don't want to get too into this right now and it's not that important

right now we only do this webhook redelivery thing with github. not sure if other providers offer something similar, but if they do, the same counters have a "service" label and can be used

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.24%. Comparing base (66d2b33) to head (f230561).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

❗ There is a different number of reports uploaded between BASE (66d2b33) and HEAD (f230561). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (66d2b33)	HEAD (f230561)
unit	2	1
integration	2	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1066      +/-   ##
==========================================
- Coverage   97.53%   90.24%   -7.30%     
==========================================
  Files         466      466              
  Lines       38163    38176      +13     
==========================================
- Hits        37223    34451    -2772     
- Misses        940     3725    +2785     

Flag	Coverage Δ
integration	?
unit	90.24% <100.00%> (+<0.01%)	⬆️

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[github-actions]

✅ All tests successful. No failed tests were found.

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