chore: remove .git-blame-ignore-revs

[Upd4ting]

Summary

Remove .git-blame-ignore-revs. The file only listed the oxfmt formatting commit from the Biome migration and is no longer wanted.

Related issue

None; repository housekeeping.

Verification

• Confirmed no other file references .git-blame-ignore-revs or blame.ignoreRevsFile.
• File deletion only; no code, build, or test impact.

Checklist

• The pull request title follows Conventional Commits.
• I added or updated tests when behavior changed.
• I updated documentation when users or contributors are affected.
• I documented breaking changes and migration steps.
• I did not include credentials or unrelated changes.