Summary:
This isolates and parallelize all the BUCK related work inside a `test_buck` job, so it's immediately clear where a failure happend.
I've also added a couple of minor improvements:
- Don't clone okbuck just to consume a script. I've copied the script over instead.
- Removed unnecessary `buck_cache_key`
This should reduce ~5 minute of build time from Test Android which was already beyond 10 minutes.
## Changelog
[Internal] - Isolate the buck OSS commands inside test_buck
Pull Request resolved: https://github.com/facebook/react-native/pull/34378
Test Plan: Let's wait for a `test_buck` and `test_android` output.
Reviewed By: cipolleschi
Differential Revision: D38580359
Pulled By: cortinico
fbshipit-source-id: 8b3915bbc28b4a7a169011fe9047f402c2d1f6ee
