[playground:ci] Don't install compiler deps twice (#31995)

The compiler playground already installs the compiler's dependencies in
a preinstall step. No need to repeat it in CI.

---
[//]: # (BEGIN SAPLING FOOTER)
Stack created with [Sapling](https://sapling-scm.com). Best reviewed
with [ReviewStack](https://reviewstack.dev/facebook/react/pull/31995).
* __->__ #31995
* #31994