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/[email protected]

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[github-actions]

Dependency Review

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.66%. Comparing base (c0b4a8d) to head (848746e).

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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[jescalada]

@coopernetes I just did some testing with the git-proxy-plugin-samples and things are apparently working:

Set-Location "c:\Users\jescalada\git-proxy\plugins\git-proxy-plugin-samples"; node -e "const p=require('@finos/git-proxy/plugin'); const a=require('@finos/git-proxy/proxy/actions'); console.log('plugin keys:', Object.keys(p).slice(0,5)); console.log('Step:', typeof a.Step); console.log('CJS subpaths: OK');"
plugin keys: [
  'PluginLoader',
  'PushActionPlugin',
  'PullActionPlugin',
  'isCompatiblePlugin'
]
Step: function
CJS subpaths: OK

Set-Location "c:\Users\jescalada\git-proxy\plugins\git-proxy-plugin-samples"; node --input-type=module -e "import { PullActionPlugin } from '@finos/git-proxy/plugin'; import { Step } from '@finos/git-proxy/proxy/actions'; console.log('PullActionPlugin:', typeof PullActionPlugin, 'Step:', typeof Step); console.log('ESM subpaths: OK');"
PullActionPlugin: function Step: function
ESM subpaths: OK

Set-Location "c:\Users\jescalada\git-proxy\plugins\git-proxy-plugin-samples"; node --input-type=module -e "import './index.js'; console.log('index.js loaded OK');"
index.js loaded OK

Set-Location "c:\Users\jescalada\git-proxy\plugins\git-proxy-plugin-samples"; node -e "require('./example.cjs'); console.log('example.cjs loaded OK');"
example.cjs loaded OK

I'm not sure how publishing the git-proxy-plugin-samples would work if we first need the v2.0.0 release to exist for the import to work. I'm guessing we should publish the rc.6 for now, then get git-proxy v2.0.0 out with the included git-proxy-plugin-samples: v0.1.2 subpackage?