Add conformance profile for NGINX Gateway Fabric

[kate-osborn]

What type of PR is this? /area conformance

What this PR does / why we need it: Updates conformance profile for NGINX Gateway Fabric.

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

Hi @kate-osborn. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kate-osborn, robscott

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Needs approval from an approver in each of these files: - ~~[conformance/OWNERS](https://github.com/kubernetes-sigs/gateway-api/blob/main/conformance/OWNERS)~~ [robscott] - ~~[site-src/OWNERS](https://github.com/kubernetes-sigs/gateway-api/blob/main/site-src/OWNERS)~~ [robscott] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[robscott]

/ok-to-test

[robscott]

Thanks @kate-osborn!

/lgtm