Nightly Conformance Tests Fail

[pleshakov]

Describe the bug
As of Jan 29 2024, nightly conformance tests fail

To Reproduce
See https://github.com/nginxinc/nginx-gateway-fabric/actions/runs/7691006269/job/20955653116

go: finding module for package sigs.k8s.io/gateway-api/apis/v1/validation
go: github.com/nginxinc/nginx-gateway-fabric/internal/mode/static/state imports
	sigs.k8s.io/gateway-api/apis/v1/validation: package sigs.k8s.io/gateway-api/apis/v1/validation provided by sigs.k8s.io/gateway-api at latest version v1.0.0 but not at required version v1.0.1-0.20240125175351-1edf7e93ae4b
make: *** [Makefile:26: update-go-modules] Error 1
Error: Process completed with exit code 2.

Expected behavior
no failure

Your environment

Additional context
The reason for failure is Gateway API removed validation package used by Webhook.
compare:

• v1.0.0 -- https://github.com/kubernetes-sigs/gateway-api/tree/v1.0.0/apis/v1
• main branch (Jan 29 2024) -- https://github.com/kubernetes-sigs/gateway-api/tree/1edf7e93ae4bb8c5ea5cc2193586cfe1e5d15e2f/apis/v1

However, we also used that package to rerun Webhook validation, according to https://github.com/nginxinc/nginx-gateway-fabric/blob/b77e9c2a42ba57f6228056d56a986eed4f531083/design/resource-validation.md

Conformance tests started failing in Dec -- https://github.com/nginxinc/nginx-gateway-fabric/actions/runs/7204325805 -- after this was merged in the Gateway API repo kubernetes-sigs/gateway-api@052e0d1

[sjberman]

Per an offline conversation, the likely approach when we upgrade to 1.1 of the Gateway API is to remove this validation and let the CRDs be the sole source of validation (except for a single validation case which I believe is still needed in the code, can't remember off the top of my head what that case is).

Also need to ensure that we remove any panics that we currently have for validation failures, and instead use logs and events.

[mpstefan]

Per our community meeting discussion, we can remove the code for the webhook to fix our nightly runs.