_CALL_ALLOC_AND_ENTER_INIT will be addressed in a separate PR

This needs to acquire a critical section on the list.

- Modify `get_init_for_simple_managed_python_class` to return both init
  as well as the type version at the time of lookup.
- Modify caching logic to verify that the current version of the type
  matches the version at the time of lookup. This prevents potentially
  caching a stale value if we race with an update to __init__.
- Only cache __init__ functions that are deferred in free-threaded builds.
  This ensures that the borrowed reference to __init__ that is stored in
  the cache is valid if the type version guard in _CHECK_AND_ALLOCATE_OBJECT
  passes:
  1. The type version is cleared before the reference in the MRO to __init__
     is destroyed.
  2. If the reference in (1) was the last reference then the __init__ method
     will be queued for deletion the next time GC runs.
  3. GC requires stopping the world, which forces a synchronizes-with operation
     between all threads.
  4. If the GC collects the cached __init__, then type's version will have been
     updated *and* the update will be visible to all threads, so the guard
     cannot pass.
- There are no escaping calls in between loading from the specialization cache
  and pushing the frame. This is a requirement for the default build.

… issue

…rf trampoline

Fix a bug in `_CREATE_INIT_FRAME` where the frame is pushed to the stack on failure.
`_CREATE_INIT_FRAME` pushes a pointer to the new frame onto the stack for consumption
by the next uop. When pushing the frame fails, we do not want to push the result (NULL)
to the stack because it is not a valid stackref and will be exposed to the generic
error handling code in the interpreter loop. This worked in default builds because
`PyStackRef_NULL` is `NULL` in default builds, which is not the case in free-threaded
builds.