fix(plugins): update sample plugin imports to use package subpath exports

[coopernetes]

Summary

• Updates index.js and example.cjs in git-proxy-plugin-samples to import from the correct package subpath exports (@finos/git-proxy/plugin, @finos/git-proxy/proxy/actions) instead of internal source paths (@finos/git-proxy/src/plugin.js, @finos/git-proxy/src/proxy/actions) which are not defined in the exports map and throw ERR_PACKAGE_PATH_NOT_EXPORTED at runtime
• Bumps @finos/git-proxy-plugin-samples to 0.1.2
• Bumps peer dependency to ^2.0.0

Blocked on

Depends on #1480 — the dist/src/ content (where subpath exports resolve to) is excluded from the published package until that PR's .npmignore → files allowlist change lands.

Test plan

• Merge fix: broken plugin exports #1480 first
• npm install in plugins/git-proxy-plugin-samples against the published 2.0.0 tarball
• Verify require('@finos/git-proxy/plugin') and import ... from '@finos/git-proxy/plugin' resolve without ERR_PACKAGE_PATH_NOT_EXPORTED
• Publish @finos/git-proxy-plugin-samples@0.1.2

[netlify]

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Name	Link
🔨 Latest commit	42e5131
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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 42e5131.

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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 (50f88d7) to head (42e5131).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1484   +/-   ##
=======================================
  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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