Change default method of disabling JIT

https://wiki.php.net/rfc/jit_config_defaults
Closes GH-12678

Improve jit tests

Closes GH-12425

Fix GH-12380: JIT+private array property access inside closure accesses private property in child class

For private fields, the scope has to be taken into account, otherwise
the property

Fix GH-12380: JIT+private array property access inside closure accesses private property in child class

For private fields, the scope has to be taken into account, otherwise
the property info may come from the wrong ce.

Closes GH-12381.

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