fix(ci): remove redundant e2e gate job

[containermom]

The custom gate job duplicated protections already provided by Prow and GitHub org-level rulesets in the kubernetes-sigs org. Fork PRs don't receive secrets by default, and Prow's ok-to-test mechanism handles external contributor approval.

Description

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Helm chart change
• Other (please describe)

Testing

• Unit tests added/updated
• Helm chart tests pass (helm lint and template validation)
• Tested changes manually
• Added examples for new features

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have updated the relevant CRDs if needed
• I have updated the Helm chart version if needed
• I have added tests that prove my fix is effective or that my feature works

Additional context

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: containermom
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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.66%. Comparing base (0783b6d) to head (8dc1937).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #432   +/-   ##
=======================================
  Coverage   55.66%   55.66%           
=======================================
  Files          58       58           
  Lines        8705     8705           
=======================================
  Hits         4846     4846           
  Misses       3515     3515           
  Partials      344      344           

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