fix: default author.name to git config.user

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🐛 Bug: Lint complaint on missing author on --preset everything #2279
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

If getNpmDefaults (npm-user) isn't able to retrieve the npm name, then we can always fall back to git config user.name.

🎁

[codecov]

Codecov Report

❌ Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.78%. Comparing base (67102a8) to head (3aac8e8).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/base.ts	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2280      +/-   ##
==========================================
- Coverage   99.80%   99.78%   -0.02%     
==========================================
  Files         136      136              
  Lines        6110     6123      +13     
  Branches      509      511       +2     
==========================================
+ Hits         6098     6110      +12     
- Misses         12       13       +1     

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[github-actions]

🎉 This is included in version v2.46.4 🎉

The release is available on:

• GitHub releases
• npm package (@latest dist-tag)

Cheers! 📦🚀