test: Fix flaky network test for service endpoint updates

[aryasoni98]

The test 'Networking Granular Checks: Services should update endpoints: http' was failing intermittently due to a race condition between pod deletion and endpoint updates. This change adds explicit wait for endpoint updates after pod deletion, improves error logging for better debugging, sets appropriate timeout for endpoint update checks, and provides better status reporting during the test.

Fixes #131370

What type of PR is this?

/kind bug
/kind flake
/kind failing-test

What this PR does / why we need it:

This PR fixes a flaky test in the networking e2e test suite. The test was failing intermittently due to a race condition where it would check for endpoint updates too quickly after pod deletion, before the endpoint controller had time to update the endpoints.

Changes made:

• Added explicit wait condition using wait.PollWithContext after pod deletion
• Added proper error logging to help diagnose issues
• Set a reasonable timeout (30 seconds) for endpoint updates
• Added status reporting during the endpoint update check
• Improved error messages for debugging failures

Which issue(s) this PR fixes:

Fixes #131370

Special notes for your reviewer:

The main change is the addition of a wait condition after pod deletion. This ensures that we properly wait for the endpoint controller to update the endpoints before proceeding with the test. The wait condition checks every second for up to 30 seconds, which should be more than enough time for the endpoint controller to process the pod deletion and update the endpoints.

The error logging has also been improved to make it easier to diagnose any future issues. If the endpoints don't match the expected state, the logs will now show both the current and expected endpoint lists.

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

This change follows the best practices for e2e test reliability as documented in:
- [Test Guidelines]: https://git.k8s.io/community/contributors/devel/sig-testing/testing.md
- [Flaky Tests]: https://git.k8s.io/community/contributors/devel/sig-testing/flaky-tests.md

Let me know if you'd like me to:
1. Modify any part of the PR description
2. Add more details about the changes
3. Include additional documentation links
4. Help with anything else related to the PR

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @aryasoni98. Thanks for your PR.

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The list of commits with invalid commit messages:

• acd2314 test: Fix flaky network test for service endpoint updates
• 8eeafb2 kubelet: log startup probe failures as Normal events

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: aryasoni98
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