fix: broken plugin exports

[jescalada]

Fixes #1474. Replaces .npmignore with files allowlist in package.json

(Replaces #1480 which couldn't be promptly merged due to reviewer/last pusher issues)

Tested by running npm run build && npm pack and then, in a separate directory, installing the generated tarball and running node -e "require('@finos/git-proxy/plugin')".

[netlify]

✅ Deploy Preview for endearing-brigadeiros-63f9d0 canceled.

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🔨 Latest commit	6529fc3
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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Snapshot Warnings

⚠️: No snapshots were found for the head SHA 6529fc3.

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Scanned Files

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.66%. Comparing base (4e2eea8) to head (6529fc3).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1489   +/-   ##
=======================================
  Coverage   89.66%   89.66%           
=======================================
  Files          68       68           
  Lines        4869     4869           
  Branches      888      888           
=======================================
  Hits         4366     4366           
  Misses        485      485           
  Partials       18       18           

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[jescalada]

@coopernetes Does this work?

[coopernetes]

Good to merge, thanks @jescalada !

[jescalada]

Great!