QueryHistory: prevent query history tests from failing if the suite is rerun (#60462)

remove all queries from query history after running suite

e2e/various-suite/explore.spec.ts

@@ -47,5 +47,10 @@ e2e.scenario({
     // Both queries above should have been run and be shown in the query history
     e2e.components.QueryTab.queryHistoryButton().should('be.visible').click();
     e2e.components.QueryHistory.queryText().should('have.length', 2).should('contain', 'csv_metric_values');
+
+    // delete all queries
+    cy.get('button[title="Delete query"]').each((button) => {
+      button.trigger('click');
+    });
   },
 });