Add v3 API metrics (#9468)

* Enable envoy discovery service

* Attempt to Move version to 1.18.2

* Bump version to 1.18.3

* Update server version info

* remove pip3 and use pip

* add pip to envoy image

* fix envoy yaml for api v3

* Add api v3 env

* Add missing metrics

* Update e2e tests

* Fix metadata columns

* Remove assert all

* Assert metric v3 at least 0

* Fix metadata

* Fix bench

* Rename cluster_name tag

* Add v3 metrics description

Co-authored-by: HantingZHANG <[email protected]>
Co-authored-by: Luis Gonzalez <[email protected]> 8920f58