Convert experimental_module_requirements_test_requirements to new Class

Seems like a good conversion

Giving this its proper parent.

Agree this is RTBC. Small changes. The new class implementation is identical to the old procedural version. The comments look fine. I might split hairs, but it's not worth it. 😂

Thanks!
-Derek

The Needs Review Queue Bot → tested this issue. It no longer applies to Drupal core. Therefore, this issue status is now "Needs work".

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Restoring status.