refactor: extract grid sorter icons into separate CSS file (#10560)

Author: sissbruecker

packages/vaadin-lumo-styles/components/grid-sorter.css

@@ -4,14 +4,7 @@
  * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
  */
 @import '../src/components/grid-sorter.css';
-
-@font-face {
-  font-family: 'vaadin-grid-sorter-icons';
-  src: url(data:application/font-woff;charset=utf-8;base64,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)
-    format('woff');
-  font-weight: normal;
-  font-style: normal;
-}
+@import '../src/components/grid-sorter-icons.css';
 
 :root::before,
 :host::before {