Improve robustness when panning/tilting/zooming during dragging actions

[nikhil-nari]

Description

This PR improves aims to improve the robustness when panning/tilting/zooming during dragging actions

Changes

Sometimes during multi-finger actions like tilting or zooming, PointerUp event was sent (even though we are still pressing the button), I Added a check for this within the DragStop handler for SelectToolFsmState which ensures the left mouse button is not released before a transformation is committed by ignoring PointerUp events received while we are still dragging

Viewport Redraw Stability: Implemented an Overlays message handler for the Dragging state. Now, whenever the editor sends a redraw message while dragging, it is prevented from dropping out of Dragging mode.

I will be working on related Paper Cut issues within this PR.
https://github.com/user-attachments/assets/30d4d338-9ffb-409e-b3a1-29b749fbbde8

Part of #3500 (drag offset)

[nikhil-nari]

Hi @Keavon I have fixed the first issue of #3500 (drag offset during PTZ), can you please have a look at it when you are available?
I will be working on the remaining issues of #3500 ASAP
Thank you

[0HyperCube]

Hi @nikhil-nari. You did not fix "drag offset during PTZ" like you claim. All you did was disable the overlays whilst dragging (which is not desired). Please test your code. Thanks.

Also please refrain from doing too many things in one PR.