Explore: Use new icons for split pane resizing (#60391)

* Add icons, use them for split pane resizing

* Change icons

* Apply scale to child div

* Use fancier logic for displaying icon

* Remove color fill on icon

* Change icons, remove scale

* Change icons and logic

packages/grafana-data/src/types/icon.ts

@@ -104,6 +104,8 @@ export const availableIconsIndex = {
   'gf-landscape': true,
   'gf-layout-simple': true,
   'gf-logs': true,
+  'gf-movepane-left': true,
+  'gf-movepane-right': true,
   'gf-portrait': true,
   'gf-service-account': true,
   'gf-show-context': true,