Tests: Remove check for main button existence in "before all" hook

The individual tests also do this check, so it's redundant

Author: kyoto

tests/tests/lightspeed-install.cy.ts

@@ -184,16 +184,6 @@ spec:
     defaultProvider: openai
     logLevel: INFO`;
     cy.exec(`echo '${config}' | oc create -f - --kubeconfig ${Cypress.env('KUBECONFIG_PATH')}`);
-
-    cy.get('body').then(($body) => {
-      if ($body.find('.pf-v5-c-alert:contains("Web console update is available")').length > 0) {
-        cy.get('.pf-v5-c-alert', { timeout: 2 * MINUTE })
-          .contains('Web console update is available', { timeout: 2 * MINUTE })
-          .should('exist');
-      } else {
-        cy.get(mainButton, { timeout: 5 * MINUTE }).should('exist');
-      }
-    });
   });
 
   after(() => {