ref: decouple posting the PR comment and creating the message

[joseph-sentry]

• recreates existing test results notifier build message implementation in standalone function
• reimplements that using Jinja instead of simple string concatenation
• reimplements BaseNotifier logic as simpler post_comment function

[codecov]

Codecov Report

Attention: Patch coverage is 94.26230% with 7 lines in your changes missing coverage. Please review.

Project coverage is 94.31%. Comparing base (3ff9444) to head (574c093).
Report is 15 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
apps/worker/services/test_analytics/ta_notify.py	86.79%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #297      +/-   ##
==========================================
- Coverage   94.31%   94.31%   -0.01%     
==========================================
  Files        1229     1232       +3     
  Lines       45294    45378      +84     
  Branches     1448     1448              
==========================================
+ Hits        42721    42799      +78     
- Misses       2269     2275       +6     
  Partials      304      304              

Flag	Coverage Δ
workerintegration	61.46% <50.00%> (-0.13%)	⬇️
workerunit	90.53% <94.26%> (-0.08%)	⬇️

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[codecov-notifications]

Codecov Report

Attention: Patch coverage is 94.26230% with 7 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
apps/worker/services/test_analytics/ta_notify.py	86.79%	7 Missing ⚠️

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