Snap current position to the edge on animation finished

[TokageItLab]

• Fixed [AnimationPlayer] Discrepancy between 'current_animation_position' and 'current_animation_length' when animation is finished #95021
• Fixed AnimationPlayer doesn't call methods when they are at the end of the animation consistently #95052

On finish the animation, make the current position snap to the length of the animation.

This will cause a decimal point error between the internal delta and the process delta, but since the animation ends immediately, I assume that this is not a problem in this case.

[akien-mga]

Thanks!