TINY-10688: Support using pnpm-workspace.yaml

[danoaky-tiny]

Related Ticket: TINY-10688

Description of Changes:
If the workspaces prop inside of the project's package.json is unused, check if there's a pnpm-workspace.yaml file then use pnpm list -r --only-projects --json to find workspaces instead.

Pre-checks:

• Changelog entry added
• package.json versions have not been changed (done by Lerna on release)
• Tests have been added (if applicable)

Before merging:

• Ensure internal dependencies are on appropriate versions
  • For stable releases, all dependencies must be stable
  • For release candidates, all dependencies must be release candidates or stable

[TheSpyder]

Note bedrock doesn't have an automated release process, so you'll probably need help from an admin to publish once we're ready to do a new release