update prow script and e2e test

[oliviassss]

Issue

Description

1. Updated prow script for internal CI jobs running in isolated regions
2. added the cleanup step in multi_path_backend_test in AfterEach()
3. Add test coverage for internal ALB/NLB

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2765407) 55.75% compared to head (37665aa) 55.75%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3456   +/-   ##
=======================================
  Coverage   55.75%   55.75%           
=======================================
  Files         149      149           
  Lines        8843     8843           
=======================================
  Hits         4930     4930           
  Misses       3579     3579           
  Partials      334      334           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[oliviassss]

/retest

[oliviassss]

all the ingress and service tests cases passed, no error in the controller logs. but the job failed in the end with the error message

Error: deadline surpassed waiting for AWS load balancers to be deleted: k8s-e2egroupafac4b78-3b654f1c2d
+ echo 'unable to delete cluster lb-controller-e2e-3456-1724866415791443968'
unable to delete cluster lb-controller-e2e-3456-1724866415791443968
+ return 1
+ echo 'unable to delete cluster lb-controller-e2e-3456-1724866415791443968'
unable to delete cluster lb-controller-e2e-3456-1724866415791443968
+ return 1
make: *** [Makefile:197: e2e-test] Error 1 

Need to reach out to the test account owners to take a further look from here.

[oliviassss]

Issue opened in kubernetes/k8s.io: kubernetes/k8s.io#6086

[oliviassss]

/retest

[M00nF1sh]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: M00nF1sh, oliviassss

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[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[k8s-ci-robot]

PR needs rebase.

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