@grafana/ui: Fix UI issues for cascader button dropdown and query input (#29727)

* Fix broken cascader width

* Remove text cursor in area where it does not affect slate

public/sass/components/_slate_editor.scss

@@ -13,7 +13,6 @@
   padding: 6px 8px;
   padding: 6px 8px;
   min-height: $input-height;
   min-height: $input-height;
   width: 100%;
   width: 100%;
-  cursor: text;
   line-height: $line-height-base;
   line-height: $line-height-base;
   color: $text-color;
   color: $text-color;
   background-color: $input-bg;
   background-color: $input-bg;

public/sass/pages/_explore.scss

@@ -435,6 +435,8 @@
 // React-component cascade fix: vertical alignment issue with Safari
 // React-component cascade fix: vertical alignment issue with Safari
 .rc-cascader-menu {
 .rc-cascader-menu {
   vertical-align: top;
   vertical-align: top;
+  // To fix cascader button width issue in windows + firefox
+  scrollbar-width: thin;
 }
 }
 
 
 // TODO Experimental
 // TODO Experimental