Add OIDC configuration auto discovery support

[omerap12]

Issue

#2921

Description

Introduced new functionality to alb.ingress.kubernetes.io/auth-idp-oidc annotation, support for OIDC configuration using discoveryEndpoint to fetch OIDC details dynamically. Enhanced documentation with instructions and example for using discoveryEndpoint in OIDC configuration. Created unit tests to validate the implementation and functionality of OIDC Discovery feature.

Checklist

• [x] Added tests that cover your change (if possible)
• [x] Added/modified documentation as required (such as the README.md, or the docs directory)
• [ ] Manually tested
• [x] 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?! :exploding_head:

• [ ] Backfilled missing tests for code in same general area :tada:
• [ ] Refactored something and made the world a better place :star2:

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: omerap12 Once this PR has been reviewed and has the lgtm label, please assign johngmyers for approval. For more information see the Kubernetes Code Review Process.

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 43.75000% with 18 lines in your changes missing coverage. Please review.

Project coverage is 18.23%. Comparing base (e5d625f) to head (9621e73).

Files	Patch %	Lines
pkg/networking/utils.go	0.00%	16 Missing :warning:
pkg/ingress/auth_config_builder.go	87.50%	1 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3747      +/-   ##
==========================================
+ Coverage   18.20%   18.23%   +0.02%     
==========================================
  Files         175      175              
  Lines       29280    29312      +32     
==========================================
+ Hits         5330     5344      +14     
- Misses      23584    23601      +17     
- Partials      366      367       +1     

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[shraddhabang]

/ok-to-test

[shraddhabang]

/lgtm

[oliviassss]

@omerap12, thanks for the contribution, overall lgtm. can you please add the manual test in your PR description? Thanks/

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[omerap12]

@omerap12, thanks for the contribution, overall lgtm. can you please add the manual test in your PR description? Thanks/

Done :)

[k8s-ci-robot]

PR needs rebase.

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[omerap12]

@oliviassss , should I close this?