Refactor and add tests for stream filters #20045
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This has uncovered a memory leak, which I'm not exactly sure how it needs to be fixed.
These tests are in preparation for some refactoring I was doing and realised there were insufficient tests.
A thing, that probably requires an RFC that would be a good idea is to mandate that the class name passed to
stream_filter_register
actually exists and is a child ofphp_user_filter