tcp: switching to the new pool (#13012)

Flipping envoy.reloadable_features.new_tcp_connection_pool to true by default

Risk Level: High (but has been successfully smoke tested in prod this time)
Testing: extensive
Docs Changes: n/a
Release Notes: were there from last time

Signed-off-by: Alyssa Wilk <alyssar@chromium.org>

source/common/runtime/runtime_features.cc

@@ -76,6 +76,7 @@ constexpr const char* runtime_features[] = {
     "envoy.reloadable_features.http_transport_failure_reason_in_body",
     "envoy.reloadable_features.http2_skip_encoding_empty_trailers",
     "envoy.reloadable_features.listener_in_place_filterchain_update",
+    "envoy.reloadable_features.new_tcp_connection_pool",
     "envoy.reloadable_features.overload_manager_disable_keepalive_drain_http2",
     "envoy.reloadable_features.preserve_query_string_in_path_redirects",
     "envoy.reloadable_features.preserve_upstream_date",
@@ -95,8 +96,6 @@ constexpr const char* runtime_features[] = {
 constexpr const char* disabled_runtime_features[] = {
     // TODO(asraa) flip this feature after codec errors are handled
     "envoy.reloadable_features.new_codec_behavior",
-    // TODO(alyssawilk) flip true after the release.
-    "envoy.reloadable_features.new_tcp_connection_pool",
     // Sentinel and test flag.
     "envoy.reloadable_features.test_feature_false",
 };