Ability to run cloud function that uses yarn 2 plug and play mode without invoking yarn.

We experience about 2x memory usage when using cloud function in yarn 2 plug and play, zero install mode.

- in https://github.com/yarnpkg/berry/discussions/2884#discussioncomment-728054 people elaborate that using sometehing like `node -r ./.pnp.cjs ...` without calling yarn directly should help mitigate this problem.
- [google cloud buildpack doc](https://cloud.google.com/docs/buildpacks/nodejs#application_entrypoint) mentions following:
>  We recommend using a Procfile because it takes npm or yarn out of the path.

This makes me think that maybe, it should be somehow possible to alter default ` /bin/bash -c yarn functions-framework` command into something more yarn pnp friendly, possibly by providing some form of custom procfile in the code deployed?

Alternatively - maybe there is some other issue in zero install mode? we do have workspace-tools plugin installed, and verified that `yarn workspaces focus --all --production` gets called during cloud function build process.