Initial cut for removing the old API.

Remove API reverse proxy server and google dependencies.
Remove API config.
Remove API client.
Remove API GRPC server.
Remove unused ImageCopy function. image.Duplicate is used.
Update Makefile to avoid protobuf builds.

Signed-off-by: Matt Hink <mhink@ciq.com>

CHANGELOG.md

@@ -14,6 +14,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 - Updated 70-persistent-net.rules.ww to use `(lower $netdev.Type)` for case-insensitive comparison of "infiniband".
 
+### Removed
+
+- Removed the gRPC API servers and client. #1876
+
 ## v4.6.1, 2025-04-04
 
 ### Added