feat: scripts in workspace root should ignore workspaces

[lukekarrys]

When running things like npm run lint and npm test in the root of a monorepo, the globs pick up paths in workspaces.

I think we should do two things in our generated files:

• In a workspace root, generate ignore patterns for any workspace dirs
• If the workspace root is not a package of its own and only exists to hold the workspaces, npm run lint and npm test should be wrappers around npm run lint -ws and npm test -ws.