Prevent read-after-free in the queued CallableCustomStaticMethodPointer, fixes slot >= slot_max errors in release templates

[bruvzg]

Fixes #85263 and fixes #70910

[akien-mga]

Tested this PR, I confirm it fixes both issues.

For #70910, I tested all the linked MRPs I could find (unless they required C#).

Fixed by this PR:

• Error spam (and/or crash) in release template / exported builds: "slot >= slot_max" is true. Returning: nullptr #70910 (comment)
• Exported Version of Game Crashes at Random When Switching Scenes/Levels (slot >= slotmax) #75802
• Random crashes when switching scenes only on release builds #79318

Already fixed by #78988:

• Windows release export crashes on scene change #75422 (comment)

[akien-mga]

Looks good to me. I tested and it fixes the issue.

I assume the reason this was excluded in debug builds is for performance, though it would be good to benchmark whether there's a significant performance difference.

But from experience we tend to exclude too much stuff for non-DEBUG_ENABLED without profiling if it's worth it, and these discrepancies often lead to fairly bad bugs like this one.

So let's fix the bug and see if there's any negative impact on performance (which would still be better than games crashing).

[akien-mga]

Thanks! This should solve a lot of pain points publishing release builds.

[YuriSizov]

Cherry-picked for 4.1.4. (I also included some changes to error macros from #83003 which were causing conflicts when picking.)