[Bug] Update report json schema for git branch information

[wcchang1115]

PR checklist

• [x] Ensure you have added or ran the appropriate tests for your PR.
• [x] DCO signed

What type of PR is this? bug

What this PR does / why we need it:

• after v0.34.0, git_branch information in a run report could be null when compared with git references other than branches.

Which issue(s) this PR fixes: sc-32458

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[codecov[bot]]

Codecov Report

Merging #914 (0f50269) into main (c35b2b7) will increase coverage by 0.00%. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #914   +/-   ##
=======================================
  Coverage   48.00%   48.01%           
=======================================
  Files          78       78           
  Lines       10751    10751           
=======================================
+ Hits         5161     5162    +1     
+ Misses       5590     5589    -1     

see 1 file with indirect coverage changes

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