SuperSelect - Fix keyboard navigation issue (HDS-5298) (#3333)

Author: KristinLBradley

.changeset/public-towns-write.md

@@ -0,0 +1,7 @@
+---
+"@hashicorp/design-system-components": patch
+---
+
+<!-- START components/form/super-select -->
+`SuperSelect` - Fixed issue with tabbing to `SuperSelectMultiple` with search enabled by adding tabindex of "0"
+<!-- END -->

packages/components/src/components/hds/form/super-select/multiple/base.hbs

@@ -5,6 +5,7 @@
 {{! Important: if an argument is added in base.hbs, it must also be added/processed in the Base component used in field.hbs }}
 <div class={{this.classNames}} {{style this.styles}}>
   <PowerSelectMultiple
+    tabindex="0"
     @afterOptionsComponent={{if
       this.showAfterOptions
       (or