fix: non-managed properties should trigger proxy load

[priyadi]

After the move to lazy ghost, properties not managed by Doctrine no longer trigger proxy initialization.

This new behavior impacts things like file uploads that rely on postLoad event handler. Accessing a file upload property does not trigger the load, so the upload property is incorrectly null, unless the consumer first triggers the load by accessing another property first (or explicitly call __load).

This PR restores the behavior of legacy proxy, and should resolve the aforementioned issue.

[priyadi]

I need some input from maintainers. The change breaks a lot of tests. the problem is that accessing test properties ($var->postLoadCallbackInvoked, $var->isCloned, etc) now triggers proxy initialization. I fixed one by changing the variable to a static variable, but I don't know if this is the best approach.

Maybe introduce a magic prefix like $__doctrineInternal_foo? Or add an attribute to mark properties that should not trigger proxy load?

@greg0ire ?

[greg0ire]

@nicolas-grekas hi! Can you help with this? I think you will have more insight.

[nicolas-grekas]

I guess we should close as duplicate of #11544 first, then continue on that other issue.

[priyadi]

closing in favor of #11544