Verify NKG against community conformance tests

[f5yacobucci]

The Gateway community maintains a set of conformance tests to inform users and implementations. As a first step in improving NKG compliance and quality, we need to verify our implementation for common expectations and begin automating our usage of these tests.

See here: https://gateway-api.sigs.k8s.io/concepts/conformance/

Due to the early nature of NKG's implementation, we may need to target tests to specific areas and work towards running a complete set.

Tasks

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1. Conformance: Set the Address field in Gateway Status nginx-kubernetes-gateway#370
   area/gateway/core conformance enhancement refined +4
   
2. Conformance: Figure out how to handle multiple Gateways nginx-kubernetes-gateway#369
   proposal +1
3. Conformance: Set Accepted Condition Type on Gateway Status nginx-kubernetes-gateway#368
   area/gateway/core conformance enhancement refined +4
   
4. Add data plane provisioner to support conformance tests nginx-kubernetes-gateway#634
   area/control-plane conformance refined +3
   
5. Set Programmed Condition in Gateway Status nginx-kubernetes-gateway#610
   area/gateway/core conformance enhancement refined +4
   
6. Set ResolvedRef Condition to True in HTTPRoute status when all references are resolved nginx-kubernetes-gateway#611
   area/httproute/core conformance enhancement refined +4
   
7. Local conformance tests nginx-kubernetes-gateway#648
   refined release-engineering +2
   
8. Automated conformance tests in pipeline nginx-kubernetes-gateway#644
   refined release-engineering +2
   

A/C:

• Run conformance tests and propose a realistic set to build upon.
• File tickets for features we do support that fail tests.
• Build a pipeline to automate conformance test runs. Make sure there's at least one test enabled and passing

[kate-osborn]

I found some blockers to running the conformance tests against NKG: #370 #369 #368

[kate-osborn]

This issue is blocked by #508

[mpstefan]

List of required issues:

• Conformance: Set the Address field in Gateway Status #370
• Conformance: Figure out how to handle multiple Gateways #369
• Conformance: Set Accepted Condition Type on Gateway Status #368
• Conformance: unblock conformance test suite #508
• Add data plane provisioner to support conformance tests #634
• Set Programmed Condition in Gateway Status #610
• Set ResolvedRef Condition to True in HTTPRoute status when all references are resolved #611