fix(test results): accept null branch and add default branch

[joseph-sentry]

previously the test results upload endpoint did not require a branch field in the data included with the upload but it also did not allow null values for the branch field, so in v0.7.3 of the CLI when we added the branch field to the upload, some uploads were broken because the CLI would not be able to detect a branch and so the branch field would be set to None.

This change modifies the endpoint to accept null values for the branch and if the endpoint is creating the Commit object in the database and the branch field is set to null then it will set the branch field of the commit to the default branch of the repo it's targetting.

[codecov-notifications]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

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[codecov-qa]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.65%. Comparing base (8339939) to head (c5db211).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

@@           Coverage Diff           @@
##             main     #708   +/-   ##
=======================================
  Coverage   91.65%   91.65%           
=======================================
  Files         632      632           
  Lines       16917    16917           
=======================================
  Hits        15506    15506           
  Misses       1411     1411           

Flag	Coverage Δ
unit	91.65% <100.00%> (ø)
unit-latest-uploader	91.65% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
upload/views/test_results.py	98.63% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[codecov-public-qa]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.65%. Comparing base (8339939) to head (c5db211).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

@@           Coverage Diff           @@
##             main     #708   +/-   ##
=======================================
  Coverage   91.65%   91.65%           
=======================================
  Files         632      632           
  Lines       16917    16917           
=======================================
  Hits        15506    15506           
  Misses       1411     1411           

Flag	Coverage Δ
unit	91.65% <100.00%> (ø)
unit-latest-uploader	91.65% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
upload/views/test_results.py	98.63% <100.00%> (ø)

... and 1 file with indirect coverage changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.00%. Comparing base (8339939) to head (c5db211).
Report is 1 commits behind head on main.

Changes have been made to critical files, which contain lines commonly executed in production. Learn more

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@               Coverage Diff                @@
##               main       #708        +/-   ##
================================================
+ Coverage   95.98000   96.00000   +0.02000     
================================================
  Files           812        812                
  Lines         18254      18323        +69     
================================================
+ Hits          17522      17591        +69     
  Misses          732        732                

Flag	Coverage Δ
unit	91.65% <100.00%> (ø)
unit-latest-uploader	91.65% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

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