Promote downstream connections monitor extension to stable (#31870)

* Promote downstream connections monitor to stable

Signed-off-by: Kateryna Nezdolii <nezdolik@spotify.com>

Mirrored from https://github.com/envoyproxy/envoy @ 25d0140b9e3e92d778fa079fb4f7356101939501

envoy/extensions/resource_monitors/downstream_connections/v3/BUILD

@@ -5,8 +5,5 @@ load("@envoy_api//bazel:api_build_system.bzl", "api_proto_package")
 licenses(["notice"])  # Apache 2
 
 api_proto_package(
-    deps = [
-        "@com_github_cncf_xds//udpa/annotations:pkg",
-        "@com_github_cncf_xds//xds/annotations/v3:pkg",
-    ],
+    deps = ["@com_github_cncf_xds//udpa/annotations:pkg"],
 )

envoy/extensions/resource_monitors/downstream_connections/v3/downstream_connections.proto

@@ -2,8 +2,6 @@ syntax = "proto3";
 
 package envoy.extensions.resource_monitors.downstream_connections.v3;
 
-import "xds/annotations/v3/status.proto";
-
 import "udpa/annotations/status.proto";
 import "validate/validate.proto";
 
@@ -12,7 +10,6 @@ option java_outer_classname = "DownstreamConnectionsProto";
 option java_multiple_files = true;
 option go_package = "github.com/envoyproxy/go-control-plane/envoy/extensions/resource_monitors/downstream_connections/v3;downstream_connectionsv3";
 option (udpa.annotations.file_status).package_version_status = ACTIVE;
-option (xds.annotations.v3.file_status).work_in_progress = true;
 
 // [#protodoc-title: Downstream connections]
 // [#extension: envoy.resource_monitors.downstream_connections]