fix: address chrome 121 scrollbar style behaviour change (#1787)

Chrome adopted offical support for scrollbar-color in chrome 121.
However, if you have both scrollbar-color and ::webkit-scrollbar
styling, they conflict and chrome will only honour the native styling.
This is bad because the native chrome mac scrollbars become really
small, and overlap too much with out golden-layout drag.

Our webkit styling forces scrollbars that match monaco and grid, and are
preferred. By removing `scrollbar-color` native styling, our webkit
styles work. We only had scrollbar-color to style firefox in dark mode
(`//applies to firefox only` is no longer true), however the most recent
versions of firefox appear to color scrollbars automatically based on
the theme, so this is no longer necessary.

The crappy part here is since this is browser change, we will have to
backport this for several active enterprise versions.

See:
-
https://stackoverflow.com/questions/77919700/scrollbars-chrome-update-121
- https://issues.chromium.org/issues/41494676

Author: dsmmcken

packages/components/scss/BaseStyleSheet.scss

@@ -45,7 +45,6 @@ body {
   padding: 0;
   overscroll-behavior: none;
   -ms-scroll-chaining: none;
-  scrollbar-color: fg-opacity(10) bg-opacity(10); //applies to firefox only
 }
 
 #root {