feat(emerge): Add new vcs fields to buildDetails API

[rbro112]

Add new vcs fields to buildDetails API

Nullable fields

[rbro112]

• feat(emerge): Add git info to frontend #97457
• feat(emerge): Add new vcs fields to buildDetails API #97456 👈 (View in Graphite)
• feat(preprod): Add new vcs related fields to preprod artifact assemble endpoint #97332
• master

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[seer-by-sentry]

Potential bug: The API response removes the `commit_id` field, but frontend code and tests still expect it, which will cause test failures and break UI components.

• Description: The ProjectPreprodBuildDetailsEndpoint is modified to no longer include the commit_id field in the vcs_info dictionary of its API response. However, consumers of this endpoint have not been updated to reflect this change. Tests in test_project_preprod_build_details.py explicitly assert the presence of this key, which will cause them to fail. Furthermore, the frontend component buildDetailsSidebarContent.tsx accesses buildDetailsData.vcs_info?.commit_id, and its corresponding TypeScript interface expects the field to exist. Removing this field is a breaking API change that will cause test failures and result in incorrect data being displayed in the user interface.
• Suggested fix: To maintain backward compatibility, re-introduce the commit_id field to the API response. Alternatively, update all consumers, including tests and frontend code, to use the new fields (e.g., head_sha) and remove their dependency on commit_id.
  _{severity: 0.85, confidence: 0.98}

_{Did we get this right? 👍 / 👎 to inform future reviews.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #97456      +/-   ##
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- Coverage   80.58%   80.58%   -0.01%     
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  Files        8557     8557              
  Lines      376468   376553      +85     
  Branches    24468    24468              
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+ Hits       303381   303437      +56     
- Misses      72717    72746      +29     
  Partials      370      370