k8s gateway route delegation should warn on matcher conflict

[jenshu]

Gloo Edge Product

Open Source

Gloo Edge Version

v1.17.x

Is your feature request related to a problem? Please describe.

[Note this issue pertains to our Kubernetes Gateway API integration, but should also be handled separately for Edge APIs]

When we enable parent matcher inheritance, parent and child route matches are merged, and in some cases child matcher fields are overwritten/dropped silently:

• header matches: for any conflicting header names, only the parent header match is used
• query params: for any conflicting query param names, only the parent query param match is used
• method: if parent specifies a method matcher, that will be used in favor of any child method matcher

We should at the least log a warning in the case of dropped child matchers. Perhaps consider adding it to the resource statuses as well.

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Describe alternatives you've considered

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Additional Context

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