Fix zend_test tests

The `--EXTENSIONS--` directive isn't properly supported prior to PHP
8.1.0, so we use the classic `--SKIPIF--` instead.

Fix `--EXTENSIONS--` section for two tests in ext/zend_test

The extension name got broken in e6cf583160f2054da92426e69143e80ee28e8e16.

Closes GH-8357.

Fix GH-8082: Prevent leaking memory on observed transient run_time_caches

This is achieved by tracking the observers on the run_time_cache (with a fixed amount of slots, 2 for each observer)

Fix GH-8082: Prevent leaking memory on observed transient run_time_caches

This is achieved by tracking the observers on the run_time_cache (with a fixed amount of slots, 2 for each observer).
That way round, if the run_time_cache is freed all associated observer data is as well.

This approach has been chosen, as to avoid any ABI or API breakage.
Future versions may for example choose to provide a hookable API for run_time_cache freeing or similar.

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Fix #81430: Attribute instantiation leaves dangling pointer

By switching attribute constructor stackframe to be called via
trampoline the stack allocation is not causing dangling pointer

Fix #81430: Attribute instantiation leaves dangling pointer

By switching attribute constructor stackframe to be called via
trampoline the stack allocation is not causing dangling pointers
in the zend_observer API anymore.

Co-Authored-By: Florian Sowade <f.sowade@suora.com>
Co-Authored-By: Christopher Becker <cmbecker69@gmx.de>
Co-Authored-By: Dmitry Stogov <dmitry@zend.com>

Closes GH-7885.

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