Migrate from @azure/core-http to @azure/core-rest-pipeline and upgrade undici to v7

[Copilot]

Migration Plan: Replace @azure/core-http with @azure/core-rest-pipeline

• [x] Update artifact package dependencies
  • [x] Remove @azure/core-http dependency from package.json
  • [x] Add @azure/core-rest-pipeline dependency
• [x] Update artifact package code
  • [x] Replace import from @azure/core-http-compat to @azure/core-rest-pipeline in blob-upload.ts
• [x] Update package-lock.json
  • [x] Run npm install to update lockfiles
• [x] Verify no other usages of @azure/ms-rest-js exist
• [x] Build and test changes
  • [x] Build the artifact package
  • [x] Run tests for artifact package (all 106 tests passed)
• [x] Initial verification
  • [x] Run linter
  • [x] Security checks
• [x] Update undici to version 7
  • [x] Update http-client package to use undici ^7.0.0
  • [x] Update github package to use undici ^7.0.0
  • [x] Update attest package to use undici ^7.0.0
  • [x] Update github package to depend on http-client ^3.0.0
  • [x] Update core package @types/node to ^24.1.0 for compatibility
  • [x] Build all packages successfully
• [x] Final verification
  • [x] Run tests for updated packages (github: 16 passed, attest: 26 passed)
  • [x] Build all packages successfully
  • [x] Run linter (passed)
  • [x] Security checks (CodeQL: no alerts, gh-advisory: no vulnerabilities)
  • [x] Ensure package symlinks are correct for monorepo development
• [x] Version bumps and documentation
  • [x] Bump http-client version to 3.1.0
  • [x] Bump github version to 6.1.0
  • [x] Bump attest version to 2.2.0
  • [x] Update RELEASES.md for http-client
  • [x] Update RELEASES.md for github
  • [x] Update RELEASES.md for attest
• [x] Fix CI build failures
  • [x] Add undici ^7.0.0 to npm overrides in root package.json
  • [x] Clean rebuild and test all packages
  • [x] Verify TypeScript compilation succeeds

Summary

Successfully migrated from deprecated Azure SDK packages and upgraded undici to v7:

• ✅ Removed @azure/core-http from artifact package
• ✅ Upgraded to @azure/core-rest-pipeline
• ✅ Upgraded undici from v5/v6 to v7 across http-client, github, and attest packages
• ✅ Bumped package versions and updated release notes
• ✅ Fixed CI build failures by adding undici override
• ✅ All tests passing
• ✅ No security vulnerabilities
• ✅ TypeScript compilation successful

Original prompt

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This section details on the original issue you should resolve

<issue_title>migrate off @azure/ms-rest-js and @azure/core-http</issue_title> <issue_description>Consider move to the more modern @azure/core-rest-pipeline

• https://github.com/search?q=repo%3Aactions%2Ftoolkit+%40azure%2Fcore-http&type=code
• https://github.com/search?q=repo%3Aactions%2Ftoolkit%20%40azure%2Fms-rest-js&type=code

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes actions/toolkit#1836

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