Summary: This reworks `gentest-validate`, to be more resilient to changes like D58307002, which cause [validation failures](https://github.com/facebook/yoga/actions/runs/9653979292/job/26627690870) due to the file traversal code not handling the presence of directories.
Differential Revision: D58987293
Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1504
I aim to consume this via a github action or workflow. Separating out the CI configuration from the actual script. We could and should maybe change this script to take in arguments for the test dirs so it is more configurable, but getting the barebones down right now.
Reviewed By: NickGerleman
Differential Revision: D51999865
fbshipit-source-id: 5792c6eec5692943518fecefc6226d784c6f0ad8
