Breaking Change: Use Editions features in Java full runtimes.

This change breaks compatibility with old generated code from previous major versions per the Cross Version Runtime policy: https://protobuf.dev/support/cross-version-runtime-guarantee. This includes old gencode from <4.26.x, which does not resolve features.

See https://protobuf.dev/news/2023-12-05/

PiperOrigin-RevId: 600487923
diff --git a/python/build_targets.bzl b/python/build_targets.bzl
index 5f4ae75..a1f1767 100644
--- a/python/build_targets.bzl
+++ b/python/build_targets.bzl
@@ -221,6 +221,7 @@
         testonly = 1,
         srcs = [
             "//:test_proto_srcs",
+            "//:test_proto_editions_srcs",
             "//src/google/protobuf/util:test_proto_srcs",
         ],
         strip_prefix = "src",