all conformance tests for v1beta1.HTTPRoute are run and required for every PR

[mlavacca]

Problem statement

With the Gateway API v1beta1 a new set of conformance tests related to the httproute has been introduced. We should support all those tests to be fully conformant with the API.

Tests to be conformant with:

• HTTPRouteCrossNamespace
• HTTPRouteDisallowedKind
• HTTPExactPathMatching
• HTTPRouteHeaderMatching
• HTTPRouteHostnameIntersection
• HTTPRouteInvalidNonExistentBackendRef
• HTTPRouteInvalidBackendRefUnknownKind
• HTTPRouteInvalidCrossNamespaceBackendRef
• HTTPRouteInvalidCrossNamespaceParentRef
• HTTPRouteInvalidReferenceGrant
• HTTPRouteListenerHostnameMatching
• HTTPRouteMatchingAcrossRoutes
• HTTPRouteMatching
• HTTPRouteReferenceGrant
• HTTPRouteRequestHeaderModifier
• HTTPRouteSimpleSameNamespace

Acceptance criteria

• All the above tests are passing

Additional Notes

There is an additional test for the extended conformance, named HTTPRouteQueryParamMatching that requires further work to be implemented. As not part of the standard compliance, it will be fixed in a separate issue. A spike already: #2778.

This issue is blocked-by #2775