Conformance: Adds Report for Kgateway with Agentgateway

[danehans]

What type of PR is this?
/kind test
/area conformance-test

What this PR does / why we need it:

Adds a v1.0.0 conformance profile and reproducer steps for kgateway with agentgateway data plane.

Which issue(s) this PR fixes:

N/A

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

@danehans: The label(s) kind/test, area/conformance-test cannot be applied, because the repository doesn't have them.

In response to this:

What type of PR is this?
/kind test
/area conformance-test

What this PR does / why we need it:

Adds a v1.0.0 conformance profile and reproducer steps for kgateway with agentgateway data plane.

Which issue(s) this PR fixes:

N/A

Does this PR introduce a user-facing change?:

NONE

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[danehans]

Hold until:

1. Pass missing override destination to load balancer agentgateway/agentgateway#438 merges
2. agentgateway publishes a release with ^ PR.
3. kgateway consumes the above agentgateway release.

/hold

[danehans]

Removing the hold:

1. https://github.com/agentgateway/agentgateway/releases/tag/v0.8.3 was published, which includes Pass missing override destination to load balancer agentgateway/agentgateway#438 (fixes Inference: Agentgateway Fails to Use EPP-Selected Endpoint agentgateway/agentgateway#436).
2. Kgateway was bumped to consume agentgateway v0.8.3: agentgateway: use JSON encoded string for defaults/overrides kgateway-dev/kgateway#12274

/unhold

[danehans]

/test pull-gateway-api-inference-extension-test-unit-main

[robscott]

What does this version mean?

[danehans]

The tip of the kgateway main branch. We have not cut the kgateway v2.1.0 release. I will update the conformance report to v2.1.0 when the release is cut (~2 weeks).

[robscott]

I think we should probably aim to add a requirement that this points to a specific point in time so it's truly reproducible, but don't want to block this report on that.

[robscott]

Thanks @danehans!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: danehans, robscott

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[robscott]

Thanks @danehans!

/lgtm