feat: update pull and branch head in commit update

[joseph-sentry]

we want to eventually replace the db triggers that exist to update the pull head and branch head when a commit is either inserted or updated

as a first step we want to duplicate the logic that those db triggers run in this commit update task which should run whenever a commit is inserted

the second step will be to run this task when a commit object is updated which is usually when we receive a webhook from github with some new information about a commit

the last step will be to remove the newly redundant db triggers

Fixes: https://github.com/codecov/internal-issues/issues/1027

[sentry-io]

🔍 Existing Issues For Review

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

📄 File: tasks/commit_update.py

Function	Unhandled Issue
run_impl	TypeError: argument of type 'NoneType' is not iterable app.tasks.commit_update.Commit... Event Count: 8.4k
run_impl	TypeError: can't compare offset-naive and offset-aware datetimes app.tasks.commit_upd... Event Count: 1.3k

---

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[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 4 lines in your changes missing coverage. Please review.

Project coverage is 97.97%. Comparing base (f7c3aad) to head (09292b5).
Report is 7 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
tasks/commit_update.py	85.18%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #915      +/-   ##
==========================================
- Coverage   97.98%   97.97%   -0.01%     
==========================================
  Files         446      446              
  Lines       35602    35668      +66     
==========================================
+ Hits        34884    34946      +62     
- Misses        718      722       +4     

Flag	Coverage Δ
integration	42.11% <94.11%> (+0.09%)	⬆️
unit	90.68% <11.76%> (-0.16%)	⬇️

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[github-actions]

✅ All tests successful. No failed tests were found.

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[codecov-notifications]

Codecov Report

Attention: Patch coverage is 94.11765% with 4 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
tasks/commit_update.py	85.18%	4 Missing ⚠️

📢 Thoughts on this report? Let us know!

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ IntegrityError: (psycopg2.errors.UniqueViolation) duplicate key value violates unique constraint "pulls_repoid_pu... app.tasks.commit_update.CommitUpdate View Issue

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