E2E: Remove time zone scenario flackyness (#55458) (#57442)

Co-authored-by: polinaboneva <polina.boneva@grafana.com>
(cherry picked from commit 7fd613ec0d)

Co-authored-by: Ivan Ortega Alba <ivanortegaalba@gmail.com>

e2e/dashboards-suite/dashboard-time-zone.spec.ts

@@ -61,8 +61,8 @@ e2e.scenario({
     e2e.components.Select.option().should('be.visible').contains(toTimeZone).click();
 
     // click to go back to the dashboard.
-    e2e.components.BackButton.backArrow().click({ force: true }).wait(5000);
-    e2e.components.RefreshPicker.runButtonV2().click();
+    e2e.components.BackButton.backArrow().click({ force: true });
+    e2e.components.RefreshPicker.runButtonV2().should('be.visible').click();
 
     for (const title of panelsToCheck) {
       e2e.components.Panels.Panel.containerByTitle(title)
@@ -76,7 +76,9 @@ e2e.scenario({
               const inUtc = timesInUtc[title];
               const inTz = element.text();
               const isCorrect = isTimeCorrect(inUtc, inTz, offset);
-              assert.isTrue(isCorrect, `Panel with title: "${title}"`);
+              expect(isCorrect, `Expect the panel "${title}" to have the new timezone applied but isn't`).to.be.equal(
+                true
+              );
             })
         );
     }