fix: improve test results processing task

[joseph-sentry]

• fixes a bug when the parsed duration is none
• adds typing to the daily_totals dictionary in bulk_write_tests_to_db

[sentry-io]

🔍 Existing Issues For Review

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

📄 File: tasks/test_results_processor.py

Function	Unhandled Issue
_bulk_write_tests_to_db	TypeError: unsupported operand type(s) for *: 'NoneType' and 'int' app.tasks.test_results.Te... Event Count: 3

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[github-actions]

✅ All tests successful. No failed tests were found.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.98%. Comparing base (612025f) to head (e3c5bf2).
Report is 3 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #938   +/-   ##
=======================================
  Coverage   97.98%   97.98%           
=======================================
  Files         445      445           
  Lines       35705    35754   +49     
=======================================
+ Hits        34985    35034   +49     
  Misses        720      720           

Flag	Coverage Δ
integration	42.11% <100.00%> (+0.07%)	⬆️
unit	90.62% <37.25%> (-0.07%)	⬇️

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[codecov-notifications]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

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