fix(mfe): build internal package if present in graph (#9383)
### Description
Previously we were relying on the proxy already being built, for
non-internal use cases this will be true, but for the internal case we
need to make sure it is built before we try to start the proxy.
### Testing Instructions
- Edit `packages/micro-frontends/dist/bin/cli.cjs` and add a `throw new
Error("oops")` to the top
- `turbo vercel-docs#dev` should fail due to the proxy script failing
- Now try with the PR `turbo`: `turbo_dev --skip-infer vercel-docs#dev`,
you will see the MFE package being built before the proxy is started.
