protos: Cleanup unused imports (#18024)

Signed-off-by: Ryan Northey <ryan@synca.io>

Mirrored from https://github.com/envoyproxy/envoy @ f08b23dbc1d92579ae2f2936e2b51c361bf1a9ba

envoy/config/endpoint/v3/endpoint_components.proto

@@ -9,7 +9,6 @@ import "envoy/config/core/v3/health_check.proto";
 
 import "google/protobuf/wrappers.proto";
 
-import "udpa/annotations/migrate.proto";
 import "udpa/annotations/status.proto";
 import "udpa/annotations/versioning.proto";
 import "validate/validate.proto";

envoy/extensions/common/key_value/v3/config.proto

@@ -4,9 +4,6 @@ package envoy.extensions.common.key_value.v3;
 
 import "envoy/config/core/v3/extension.proto";
 
-import "google/protobuf/any.proto";
-import "google/protobuf/duration.proto";
-
 import "udpa/annotations/status.proto";
 import "validate/validate.proto";