Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/43090

I'm removing test_windows from CircleCI as the job is often flaky for various reasons.
The cost of maintainaining it is so high at the moment, and it brings little to no value to our developers.
We'll re-evaluate what to do with it once we move to GHA.

Changelog:
[Internal] [Changed] - Remove test_windows from CircleCI

Reviewed By: cipolleschi

Differential Revision: D53918601

fbshipit-source-id: b76c92f1eb3d2302595773dff9f8bbc292c0bfcf