chore(changelog-check): exclude private packages from changelog check

[cryptodev-2s]

Description

This PR adds support for excluding private packages from the changelog check workflow. Private packages in a monorepo typically don't require public changelog entries since they are not published to npm.

Changes

• Added isPrivatePackage function to detect private packages by checking the private field in package.json
• Added caching for private package checks to optimize performance when multiple files in the same package are changed
• Modified getChangedPackages to skip private packages regardless of which files were changed
• Added logging when private packages are skipped for better visibility

Testing Steps

1. Using Core monorepo:

   • First, make the phishing-controller package private by adding "private": true to its package.json
   • Make dummy changes to packages/phishing-controller/src/PhishingController.ts:

     // Add a dummy comment or empty line to trigger changes
     // This is a test change for private package changelog check

   • Commit the changes

2. Test with current main version (should fail):

   # Manually copy the current changelog check script
   cp .github/workflows/changelog-check.ts (from github-tools) scripts/ (to core)
   
   # Update the execa import
   sed -i '' 's/import { execa }/import execa/' scripts/changelog-check.ts
   
   # Manually add the following to package.json under the scripts section:
   # "changelog:check": "ts-node scripts/changelog-check.ts"
   
   # Run the check
   yarn changelog:check . main 5690
   # This should fail, requiring a changelog for the private package

3. Test with new version (should pass):

   # Manually copy the updated changelog check script
   cp .github/workflows/changelog-check.ts (from github-tools) scripts/ (to core)
   
   # Update the execa import
   sed -i '' 's/import { execa }/import execa/' scripts/changelog-check.ts
   
   # Run the check
   yarn changelog:check . main 5690
   # This should pass, skipping the private package without requiring a changelog

Expected Results:

• Current version: Fails, requiring changelog for private package
• New version: Passes, skipping private package changelog requirement

[rekmarks]

LGTM!