Fix build race condition with preparePrefab missing 3p headers (#53384)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/53384

Occasionally, the `preparePrefab` task might run before other tasks that
are responsible of populating the 3p headers, such as `prepareNative3pDependencies`.

This was evident in the latest nightly which is missing the fast_float headers in the
Android prefab.

Adding a dependsOn fixes it.

Changelog:
[Internal] [Changed] -

Reviewed By: cipolleschi

Differential Revision: D80695212

fbshipit-source-id: 6e0dd17e5cf8c33d14812e5cb8fdc8b800897816