Allow to disable coverage via flag & disable it for benchmarks (#53912)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/53912

Changelog: [Internal]
Add new fantom flag `fantom_disable_coverage` to be used in tests that are sensitive to things like memory allocation.
Also disable coverage for any benchmark test.

Reviewed By: arushikesarwani94

Differential Revision: D83070065

fbshipit-source-id: a885e79e3d0c88cfb7adef30cb60ab46a617edac