[ci-app][CIAPP-936] Add More Git Metadata to Tests

[juan-fernandez]

What does this PR do?

• Add git-repo-info which reads from the .git folder and does not rely on git command.
  • The library itself is a single file with no dependencies so I think it is safe adding it.
  • ⚠️ Important: instead of using the npm library I've extracted the only relevant file and added it to our repository to fix the multiline commit message issue.
• Use git-repo-info to add commit message, author date, name and email, and committer date, name and email to all tests.

Motivation

Be able to show rich commit metadata for clients that do not use our instrumented CIs

Plugin Checklist

• Unit tests.
• TypeScript definitions.
• TypeScript tests.
• API documentation.
• CircleCI jobs/workflows.
• Plugin is exported.

Additional Notes

[juan-fernandez]

@rochdev I'll delay this a bit to see if the maintainer of git-repo-info responds to my PR (rwjblue/git-repo-info#60). There is a bug with multi line commit messages. If there's no response I'll have to figure out a solution.

[juan-fernandez]

@rochdev I've added the single logic file from git-repo-info to the PR in debfe06 as we talked about in Slack. The fix for the multiline commit message is in debfe06#diff-f79e00db382cdd07bca74e601f55ea00c7bfbf34bdf968eaf446d3e779aec710R339-R345.

[rochdev]

Could we move this to a vendor folder instead and ignore the entire folder?

[rochdev]

The file should also be added to LICENSE-3rdparty.csv similar to the TDigest entry.

[codecov]

Codecov Report

Merging #1254 (70b030a) into master (9baa26d) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1254      +/-   ##
==========================================
+ Coverage   92.56%   92.58%   +0.02%     
==========================================
  Files         150      150              
  Lines        6095     6113      +18     
==========================================
+ Hits         5642     5660      +18     
  Misses        453      453              

Impacted Files	Coverage Δ
packages/dd-trace/src/plugins/util/git.js	100.00% <100.00%> (ø)
packages/dd-trace/src/plugins/util/test.js	100.00% <100.00%> (ø)

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