fix(git-node): update regex to support GitHub App installation tokens

[aduh95]

Refs: https://github.blog/changelog/2026-04-24-notice-about-upcoming-new-format-for-github-app-installation-tokens/
Refs: https://github.blog/changelog/2026-05-15-github-app-installation-tokens-per-request-override-header/#how-to-use-it

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.17%. Comparing base (22b9f8f) to head (29663a1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1156   +/-   ##
=======================================
  Coverage   57.17%   57.17%           
=======================================
  Files          53       53           
  Lines       10394    10394           
=======================================
  Hits         5943     5943           
  Misses       4451     4451           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.