* Add a `@coversDefaultClass` annotation to address `@covers ::get_test_page_cache" is invalid` notices.
* Rename data providers to start with the `data_` prefix and match the test method names, for consistency.
* Move data providers next to the test methods they are used in.
* Move `::get_test_page_cache()` closer to `::get_test_persistent_object_cache()`, for a bit more predictable placement.
* Fix a typo in `::get_test_persistent_object_cache()` description.
Follow-up to [53955], [54043], [54044], [54045].
See #56041.
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