fix(git-node): handle multi-line trailers

[aduh95]

The current code assumes trailers will always be single-line, having a multi-line trailer currently results in non-sense output. This PR switch to relying on calling git interpret-trailers multiple times to filter out the trailers consistently.

Fixes: nodejs/node#62577 (comment)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.78%. Comparing base (f0587fa) to head (1e929e2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1062      +/-   ##
==========================================
+ Coverage   71.74%   71.78%   +0.03%     
==========================================
  Files          41       41              
  Lines        5878     5886       +8     
==========================================
+ Hits         4217     4225       +8     
  Misses       1661     1661              

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