Speed up test case

This test case did 100,000 includes of a non existing file to show the
memory leak; this is not necessary, because after the first failing
include, memory is not s

Speed up test case

This test case did 100,000 includes of a non existing file to show the
memory leak; this is not necessary, because after the first failing
include, memory is not supposed to increase for further includes.

Closes GH-7088.

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Fix #79514: Memory leaks while including unexistent file

We have to destroy (un-opened) ZEND_HANDLE_FILENAMEs.