fix(chip): fixed chip-group keyboard accessibility (#2709)

Co-authored-by: Benny Powers - עם ישראל חי! <[email protected]>

Author: nikkimk

.changeset/rotten-geese-invite.md

@@ -0,0 +1,5 @@
+---
+"@patternfly/elements": patch
+---
+
+`<pf-chip-group>`: ensures that overflow and close buttons are keyboard accessible via arrow keys

elements/pf-chip/pf-chip-group.ts

@@ -180,7 +180,7 @@ export class PfChipGroup extends LitElement {
    */
   #handleChipsChanged() {
     if (this.#chips.length > 0) {
-      const oldButtons = [...(this.#buttons || [])];
+      const oldButtons = [...(this.#tabindex.items || [])];
       const max = this.open ? this.#chips.length : Math.min(this.#chips.length, this.numChips);
       this.#buttons = [
         ...this.#chips.slice(0, max),