Frontend: Migrate PageToolbar.tsx from aria-label e2e selectors to data-testid (#79663)

* refactor: update PageToolbar to use data-testid

* refactor: update selector text

---------

Co-authored-by: joshhunt <josh@trtr.co>

packages/grafana-e2e-selectors/src/selectors/components.ts

@@ -287,7 +287,7 @@ export const Components = {
     button: (title: string) => `QueryEditor toolbar item button ${title}`,
   },
   BackButton: {
-    backArrow: 'Go Back',
+    backArrow: 'data-testid Go Back',
   },
   OptionsGroup: {
     group: (title?: string) => (title ? `Options group ${title}` : 'Options group'),

packages/grafana-ui/src/components/PageLayout/PageToolbar.tsx

@@ -92,7 +92,7 @@ export const PageToolbar = React.memo(
                 tooltip="Go back (Esc)"
                 tooltipPlacement="bottom"
                 size="xxl"
-                aria-label={selectors.components.BackButton.backArrow}
+                data-testid={selectors.components.BackButton.backArrow}
                 onClick={onGoBack}
               />
             </div>