e2e test for large extension that disables cache

[aalves08]

Summary

Fixes #10639

TO TEST/REVIEW THIS LOCALLY IT'S NEEDED:

• Support built-in plugin operator with feature flag #11036 to be merged (done!)
• needs Rancher backend 2.9-head from 24th May, 2024 minimum -> tied to setting content type header for successful proxied requests rancher#45521

Occurred changes and/or fixed issues

• Add e2e test to check that extensions with cacheState: disabled work on Rancher Dashboard

Technical notes summary

Areas or cases that should be tested

• Add git repo to Rancher for extension examples: local -> apps -> repositories
  type: git repo
  repo: https://github.com/rancher/ui-plugin-examples
  branch: main
• Install extension Large-extension and make sure it works (top-level extension -> main nav)

Areas which could experience regressions

Screenshot/Video

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
• The PR has a Milestone
• The PR template has been filled out
• The PR has been self reviewed
• The PR has a reviewer assigned
• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
• The PR has reviewed with UX and tested in light and dark mode, or there are no UX changes

[torchiaf]

LGTM