dillon1000/react

Clean up partial renderer entry points (#21682)

* Clean up partial renderer entry points

I made a mistake by leaving server.browser.stable in which is the partial
renderer for the browser build of stable. That should use the legacy fizz
one.

Since the only usage of the partial renderer now is at FB and we don't use
it with Node, I removed the Node build of partial renderer too.

* Remove GC test

No code is running this path anymore. Ideally this should be ported to
a Fizz form.