Fix failing GRPC conformance test

[lahabana]

Is there an existing issue for this?

• I have searched the existing issues

Does this enhancement require public documentation?

• I have added an Acceptance Criteria item for adding and/or adjusting public documentation (if applicable)

Problem Statement

As pointed in: https://github.com/Kong/kubernetes-ingress-controller/pull/5776/files#r1611405584

we have a few tests that do not pass with our GRPC route implementation. @tao12345666333 looked into and it seems to be a KIC problem and not a gateway problem so we should be able to make them pass

Proposed Solution

• Pass the host that has been configured in Gateway to the final generated route.

Additional information

No response

Acceptance Criteria

• The GRPCRoute conformance GRPCRouteListenerHostnameMatching tests pass in Traditional mode

[pmalek]

The GRPC conformance enabled in #5776 seems to be failing for traditional copmatible router https://app.buildpulse.io/@Kong/kubernetes-ingress-controller/tests/17956419004?filter_results_type=flaky

example: https://github.com/Kong/kubernetes-ingress-controller/actions/runs/9404948579/job/25905145650

The problematic test case seems to be

2024-06-06T17:11:27.8393367Z         --- FAIL: TestGatewayConformance/GRPCRouteHeaderMatching/3_request_to_'/gateway_api_conformance.echo_basic.grpcecho.GrpcEcho/Echo'_with_headers_'{Color:blue,Version:two}'_should_go_to_grpc-infra-backend-v2 (30.00s)

[tao12345666333]

The following are some contextual information related to the GRPCRouteListenerHostnameMatching case

• fix: allow GRPCRoute without hostnames and matches #5303
• fix: generate routes with hostname match only when GRPCRoute rule does not have matches #4512 (comment)
• gRPCRoute tranlator cannot handle wildcard rule #4154
• Allow wildcard (empty) hostname GWAPI Routes #4526

[tao12345666333]

@pmalek I will use this issue for tracking #6144

For now I have skipped
tests.GRPCRouteHeaderMatching.ShortName and enable tests.GRPCExactMethodMatching.ShortName

It will get a more stable result.