Fix OPcache tests under specific conditions

Add ASAN XLEAK support

Only disable LSAN instead of skipping the test. This way we can still detect
memory issues which is arguably more important anyway.

Closes GH-10996

Mark gh9259_003.phpt as xfail with ASAN

The tests reports memory leaks.

Fix high opcache.interned_strings_buffer causing shm corruption (#9260)