Fix segfault on debug_backtrace() in _ZendTestFiber

Fixes GH-16230
Closes GH-16299

Fix GH-16388: UB when freeing a cloned _ZendTestFiber

Since there is no need to clone instances of this test class, we
prevent cloning in the first place.

Closes GH-16400.

Revert "Port all internally used classes to use default_object_handlers"

This reverts commit 94ee4f9834743ca74f6c9653863273277ce6c61a.

The commit was a bit too late to be included i

Revert "Port all internally used classes to use default_object_handlers"

This reverts commit 94ee4f9834743ca74f6c9653863273277ce6c61a.

The commit was a bit too late to be included in PHP 8.2 RC1. Given it's a massive ABI break, we decide to postpone the change to PHP 8.3.

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Port all internally used classes to use default_object_handlers

Signed-off-by: Bob Weinand <bobwei9@hotmail.com>

Flexible fiber bailout handling (#7163)

Remove fiber context embedding

Add test for leaking prior context with symmetric coroutines

Reorganize zend_test and add custom fiber implementation tests (#7137)