ci: use local-ubuntu-latest runner for E2E tests

Use the local self-hosted runner label for internal network access
to headlamp.animaniacs.farh.net.

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

.github/workflows/e2e.yaml

@@ -9,7 +9,7 @@ on:
 
 jobs:
   e2e:
-    runs-on: k3s-animaniacs
+    runs-on: local-ubuntu-latest
     timeout-minutes: 15
 
     steps: