chore(stylelint): remove sass-lint/scss-lint in favor of stylelint

- remove scss-lint and sass-lint
- add stylelint and stylelint-order packages and configuration
- update all *.scss files to new syntax

fixes #14805

core/src/components/backdrop/backdrop.scss

@@ -6,17 +6,16 @@
 :host {
   @include position(0, 0, 0, 0);
 
-  position: absolute;
-  z-index: $z-index-backdrop;
   display: block;
+  position: absolute;
 
-  cursor: pointer;
-  opacity: .01;
   transform: translateZ(0);
 
-  touch-action: none;
-
   contain: strict;
+  cursor: pointer;
+  opacity: .01;
+  touch-action: none;
+  z-index: $z-index-backdrop;
 
   &.backdrop-hide {
     background: transparent;