Move Bullet physics query flush from Bullet space pre-tick callback to Bullet physics flush_queries()

[madmiraal]

This is where it's done in Godot physics. It ensures that the queries are flushed before _physics_process() is called; so current values are available within _physics_process().

Fixes #37702.
Fixes #40110.

[aaronfranke]

The issue says it's 2 frames late. Does this make physics 1 frame late or 0 frames late?

[madmiraal]

The issue says it's 2 frames late. Does this make physics 1 frame late or 0 frames late?

It makes it one frame "late", which is expected, as per the issue description:

3d physics stepping is two frames late using bullet physics. Expected would be that it is one frame late.

Basically, the effect of any changes made during the current physics frame should be available in the next frame.

[AndreaCatania]

This looks good, thanks!

[akien-mga]

Thanks!