CS: Exclude class file name checks more efficiently
CS: Exclude class file name checks more efficiently

https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards/blob/31f18a7168ecff69a738d7fa7687bb56902241ed/WordPress/Sniffs/Files/FileNameSniff.php#L164 shows that setting the `strict_class_file_names` property to `false` means the code that does the `InvalidClassFileName` check is not even run.

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