fix(ci): use renamed gcloud GKE auth plugin package in e2e-runner image

[jonkoops]

The e2e-runner image build fails when installing Google Cloud CLI: apt no longer provides google-cloud-sdk-gke-gcloud-auth-plugin and points to google-cloud-cli-gke-gcloud-auth-plugin instead. This updates .ci/images/Dockerfile to use the new package name.

This showed up on #5405 because push-e2e-runner.yaml runs when .yarnrc.yml changes; the failure is unrelated to the Yarn install-script work there.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Image was built and published successfully. It is available at:

• quay.io/rhdh-community/rhdh:pr-5406
• quay.io/rhdh-community/rhdh:pr-5406-e4847f21

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.69%. Comparing base (8fb16b7) to head (e4847f2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5406      +/-   ##
==========================================
- Coverage   63.68%   59.69%   -3.99%     
==========================================
  Files         121      109      -12     
  Lines        2288     2062     -226     
  Branches      527      477      -50     
==========================================
- Hits         1457     1231     -226     
- Misses        829      830       +1     
+ Partials        2        1       -1     

Flag	Coverage Δ
rhdh	59.69% <ø> (-3.99%)	⬇️

Components	Coverage Δ
Backend plugins	∅ <ø> (∅)
Backend app	69.69% <ø> (ø)
Frontend app	58.82% <ø> (ø)
Plugin utils	∅ <ø> (∅)

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