Description:
EG currently validates all XDS resources added to the resource table:

However, it seems that some resources (and/or subresources) are not really getting validated, as described in #4457 (comment)

@zhaohuabing mentioned in the community meeting that resource that are turned to protobuf Any in the translator essentially shed away their go-control-plane validators. It was proposed to scan the entire codebase for all usages of Any and ensure that a validate is being called prior just-before the transformation. Perhaps it makes sense to embed the validation in our protocov util.