GemCatalog: Gem cart widget and overlay window

* [LYN-4174] Added icons for gem catalog summary cart

* [LYN-4174] Gem Catalog: Text eliding for too long gem names and creators

* [LYN-4174] Gem catalog: Resetting filters when re-initializing for another project

* [LYN-4174] Gem Catalog: Fixed a bug with filters being applied/remembered after leaving gem catalog and coming back editing another project

* [LYN-4174] GemCatalog: Gem cart widget and overlay window

* Added cart button with dynamic label to display the number of gems to be enabled/disabled and a arrow down button to indicate some sort of pop-up/overlay window will appear on click.
* Overlay gem tags update dynamically while the dialog is open based on the gem model.
* Moved some styling from C++ to the style sheet.

Code/Tools/ProjectManager/Resources/CarrotArrowDown.svg

@@ -0,0 +1,3 @@
+<svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path fill-rule="evenodd" clip-rule="evenodd" d="M12 17L15 14H9L12 17Z" fill="white"/>
+</svg>