refactor: [M3-8632] - Use pnpm as our package manager

[bnussman-akamai]

Description 📝

Warning

Work in progress

Breaking Changes ⚠️

• The up script (yarn up) has been removed because it conflicts with pnpm up. Use pnpm dev instead to start the local development environment

Preview 📷

Warning

Work in progress

How to test 🧪

Warning

Work in progress

As an Author, I have considered 🤔

• 👀 Doing a self review
• ❔ Our contribution guidelines
• 🤏 Splitting feature into small PRs
• ➕ Adding a changeset
• 🧪 Providing/improving test coverage
• 🔐 Removing all sensitive information from the code and PR description
• 🚩 Using a feature flag to protect the release
• 👣 Providing comprehensive reproduction steps
• 📑 Providing or updating our documentation
• 🕛 Scheduling a pair reviewing session
• 📱 Providing mobile support
• ♿ Providing accessibility support

• I have read and considered all applicable items listed above.

As an Author, before moving this PR from Draft to Open, I confirmed ✅

• All unit tests are passing
• TypeScript compilation succeeded without errors
• Code passes all linting rules