Fix validator for ingress rules without http paths

[kishorj]

Issue

Fixes: #3158

Description

Ingress validator is not able to handle ingress rules without http path defined. This is introduced in PR #2735.

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 🌟

[M00nF1sh]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (14f5a70) 54.72% compared to head (4457f33) 54.73%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3159      +/-   ##
==========================================
+ Coverage   54.72%   54.73%   +0.01%     
==========================================
  Files         145      145              
  Lines        8477     8479       +2     
==========================================
+ Hits         4639     4641       +2     
  Misses       3503     3503              
  Partials      335      335              

Impacted Files	Coverage Δ
webhooks/networking/ingress_validator.go	63.73% <100.00%> (+0.81%)	⬆️

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