Ensure move_and_slide() is consistent between the 2D and 3D versions.

In the 3D version:
- Partially revert #20908 that was reverted in the 2D version as part
  of #21653. This ensures that the Vector returned is always perpendicular
  to the surface collided with; and not the floor_normal Vector passed to
  the function when on a floor.
- Include an update of the floor velocity before multiplying by the time
  delta, which was added to the 2D version as part of commit 13a8014.

In the 2D version:
- Use the Vector2.slide() function instead of Vector2.tangent() to adjust
  the amount of motion the stop_on_slope undoes to ensure that it is in the
  right direction. This is a implementation of the 3D approach from #30588.
- Combine the !found_collision and motion == Vector2() checks for break.
- Other minor formating changes to make the functions look identical.

Also renamed some variables to align with their use.

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