introduce more tests for edge cases for view culling (#51000)

Summary:
Pull Request resolved: #51000

changelog: [internal]

# Why so many tests?
Differentiator has two modes: regular and reparenting. The reparenting one is almost a completely separate Differentiator, effectively doubling the complexity. It handles quite a few different special cases and is not covered by any reasonable tests, so here I am adding the tests to make sure every branch of the reparenting Differentiator is traversed.

Reviewed By: lenaic

Differential Revision: D73845746

fbshipit-source-id: 27a9fd72a5f8111b84e231cf8f495e278037a323

Author: sammy-SC