feat: Make design-system OSS

[dogmar]

Description

This PR prepares the design-system repository for open source release. The changes include:

Infrastructure Changes:

• Removed internal CI/CD workflows (Claude Code, Claude Code Review, Slack PR notifications)
• Removed Chromatic integration and related configuration
• Updated PR title checker workflow (renamed job to check-pr-title)

Licensing:

• Added Apache 2.0 License to make the project open source

Publishing Improvements:

• Fixed OIDC authentication issues when publishing packages
• Migrated to semantic-release-pnpm plugin for better pnpm support
• Fixed beta release publishing configuration
• Updated lockfile to reflect dependency changes

This is a feature release that transitions the design-system from a private internal tool to a public open-source project.

How should this be tested?

• Verify that the PR title checker workflow still works correctly
• Confirm that internal workflows (Chromatic, Claude, Slack) have been successfully removed
• Check that the Apache 2.0 License file is present and correctly formatted
• Test the publishing pipeline by triggering a beta release
• Verify that semantic-release-pnpm correctly handles version bumps and publishes

Other information

This PR removes several internal Cleanlab workflows that were specific to private repository operations. The design system is now ready for public consumption with proper open-source licensing.

Checklist

• PR was tested and change works as expected
• PR was tested in several different browsers and devices (N/A - infrastructure changes)
• Design decisions and approaches were documented in the PR Description
• Design documents on Notion have been updated
• If applicable, new stories were added to the Storybook (N/A - no UI changes)
• Tests (unit / end-to-end) are created for new utility functions or user flows (N/A - infrastructure changes)

[github-actions]

🎉 This PR is included in version 8.5.0-beta.2 🎉

The release is available on:

• pnpm package (@beta dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[github-actions]

🎉 This PR is included in version 8.5.0 🎉

The release is available on:

• pnpm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀