test(ci): remove push trigger from UI E2E tests workflow

- Eliminated the push trigger for the UI E2E tests workflow to streamline the process and focus on pull request events.
- This change enhances the workflow by ensuring tests are only run during pull requests, reducing unnecessary executions.

.github/workflows/ui-e2e-tests.yml

@@ -1,9 +1,6 @@
 name: UI - E2E Tests
 
 on:
-  push:
-    branches:
-      - "PROWLER-182-kubernetes-add-and-connect-the-provider"
   pull_request:
     branches:
       - master