Tests: Decouple method name from hash so it's visible in tests

[irfan-dahir]

https://github.com/jikan-me/jikan/blob/972ffdb947c75a901836cb68b7845b808df57954/test/JikanTest/HttpFilesystemCacheClientCallback.php#L28

Fixtures from JikanTest.php need to have visible method names otherwise it gets hard to debug

This will require fixing broken tests as the file name will change throughout the fixtures

[github-actions[bot]]

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