feat(integrations): metrics for on-call integration SLOs

[mifu67]

Add logging via EventLifecycle and EventLifecycleMetric to PagerDuty and Opsgenie.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: src/sentry/integrations/opsgenie/client.py

Function	Unhandled Issue
send_notification	ApiUnauthorized: {"message":"Could not authenticate","took":0.007,"requestId":"78fc3a3b-c6fb-4804-826f-5486a12fed27"} ... Event Count: 1

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[codecov]

Codecov Report

Attention: Patch coverage is 90.47619% with 4 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/sentry/integrations/opsgenie/client.py	75.00%	1 Missing and 1 partial ⚠️
src/sentry/integrations/on_call/metrics.py	96.00%	1 Missing ⚠️
src/sentry/integrations/opsgenie/spec.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #78660   +/-   ##
=======================================
  Coverage   78.14%   78.14%           
=======================================
  Files        7100     7104    +4     
  Lines      312730   312802   +72     
  Branches    51074    51083    +9     
=======================================
+ Hits       244378   244451   +73     
- Misses      61977    61979    +2     
+ Partials     6375     6372    -3