Fix IngressClassParams CRD singular naming to resolve SingularConflict

[laradji]

Fixes #4200

Changes singular name from 'ingressclassparams' to 'ingressclassparam'
to follow Kubernetes naming conventions and resolve the SingularConflict
condition causing NamesAccepted: False status.

Issue

Description

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 🌟

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: laradji / name: Nacer Laradji (2f03bcb)

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[k8s-ci-robot]

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[zac-nixon]

/ok-to-test