chore(#2609): update table sort header focus visible style

Signed-off-by: Vanessa Tran <vanessa.m.tran@gov.ab.ca>

Author: vanessatran-ddi

libs/web-components/src/components/table/TableSortHeader.svelte

@@ -71,6 +71,15 @@
     color: var(--goa-color-interactive-hover);
   }
 
+  button:focus {
+    outline: none;
+  }
+
+  button:focus-visible {
+    box-shadow: 0 0 0 var(--goa-border-width-l)
+    var(--goa-color-interactive-focus);
+  }
+
   button goa-icon {
     color: var(--goa-color-interactive-default);
   }