* add upstream service targeting to property override extension
* Also add baseline goldens for service specific property override extension.
* Refactor the extension framework to put more logic into the templates.
* fix up the golden tests
* Support Listener in Property Override
Add support for patching `Listener` resources via the builtin
`property-override` extension.
Refactor existing listener patch code in `BasicEnvoyExtender` to
simplify addition of resource support.
* Support ClusterLoadAssignment in Property Override
Add support for patching `ClusterLoadAssignment` resources via the
builtin `property-override` extension.
To avoid unintended tampering with remote downstreams via service
config, refactor BasicEnvoyExtender and RuntimeConfig to disallow
typical Envoy extensions from being applied to non-local proxies.
Continue to allow this behavior for AWS Lambda and the read-only
Validate builtin extensions.
Addresses CVE-2023-2816.
Eric Haberkorn
Michael Zalimeni
Chris Thain