Separate conformance tests modules from main tests

[rikatz]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Separate conformance test modules from main modules, removing the dependency of Gateway API version.

Which issue(s) this PR fixes:

NONE

[rikatz]

/hold

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[rikatz]

/cc @jaellio

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[kfswain]

Separate conformance test modules from main modules, removing the dependency of Gateway API version.

<3 <3 <3

/approve

I see a hold on here, so will hold off on LGTM and let others give final stamp. But this is great. Thank you so much!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kfswain, rikatz

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[rikatz]

a heads up I didn't had time to tackle, https://github.com/kubernetes-sigs/gateway-api-inference-extension/blob/main/.github/dependabot.yml may need some updates as well (as @mikemorris also identified on GW API today).

If no one arrives on this PR by tomorrow I will try to fix it, otherwise I can do as a followup