Add non-alphanumeric input validation test for vpcID and fix typo

[shraddhabang]

Issue

N/A

Description

1. As per the request from security team, adding a unit test for malicious input validation for vpcid
2. Also fixed the typo for certificate arn in IngressClassParam CRD
3. Added more docs around the Cert arn support for IngressClassParam CRD.
4. Ran E2E tests locally and verified the change

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)
• [x] 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:

[wweiwei-li]

/lgtm

[k8s-ci-robot]

@wweiwei-li: changing LGTM is restricted to collaborators

In response to this:

/lgtm

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[oliviassss]

/lgtm /approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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