Fix breaking change related to upb_c_proto_library and upb_proto_reflection_library

These are referenced externally by googleapis, cel-spec, and likely soon grpc. A recent change moved them and made the moved rules private. We add a temporary shim at `//bazel:upb_c_proto_library.bzl` to unbreak googleapis and cel-spec. We also make the moved `upb_c_proto_library` and `upb_proto_reflection_library` rules public.

PiperOrigin-RevId: 863339202

Author: protobuf-github-bot

bazel/BUILD

@@ -45,6 +45,14 @@ bzl_library(
     ],
 )
 
+bzl_library(
+    name = "upb_c_proto_library_bzl",
+    srcs = ["upb_c_proto_library.bzl"],
+    deprecation = "Use upb/bazel:upb_proto_library_bzl instead",
+    visibility = ["//visibility:public"],
+    deps = ["//upb/bazel:upb_proto_library_bzl"],
+)
+
 bzl_library(
     name = "proto_descriptor_set_bzl",
     srcs = ["proto_descriptor_set.bzl"],
@@ -61,6 +69,7 @@ filegroup(
         ":java_lite_proto_library_bzl",
         ":proto_library_bzl",
         ":py_proto_library_bzl",
+        ":upb_c_proto_library_bzl",
         "//bazel/common:for_bazel_tests",
         "//bazel/flags:for_bazel_tests",
         "//bazel/toolchains:for_bazel_tests",

bazel/upb_c_proto_library.bzl

@@ -0,0 +1,15 @@
+# Copyright (c) 2026, Google LLC
+# All rights reserved.
+#
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file or at
+# https://developers.google.com/open-source/licenses/bsd
+
+# This is a temporary shim to unbreak cel-spec and googleapis which referenced this file. At some
+# point in the future we can remove this once both are updated.
+
+"""upb_c_proto_library rule"""
+
+load("//upb/bazel:upb_c_proto_library.bzl", _upb_c_proto_library = "upb_c_proto_library")
+
+upb_c_proto_library = _upb_c_proto_library

upb/bazel/upb_c_proto_library.bzl

@@ -8,8 +8,6 @@ load("//upb/bazel/private:upb_proto_library_internal/aspect.bzl", "upb_proto_asp
 load("//upb/bazel/private:upb_proto_library_internal/cc_library_func.bzl", "upb_use_cpp_toolchain")
 load("//upb/bazel/private:upb_proto_library_internal/rule.bzl", "upb_proto_rule_impl")
 
-visibility(upb_clients)
-
 UpbWrappedCcInfo = provider(
     "Provider for cc_info for protos",
     fields = ["cc_info"],

upb/bazel/upb_proto_reflection_library.bzl

@@ -9,8 +9,6 @@ load("//upb/bazel/private:upb_proto_library_internal/aspect.bzl", "upb_proto_asp
 load("//upb/bazel/private:upb_proto_library_internal/cc_library_func.bzl", "upb_use_cpp_toolchain")
 load("//upb/bazel/private:upb_proto_library_internal/rule.bzl", "upb_proto_rule_impl")
 
-visibility(upb_clients)
-
 _UpbDefsWrappedCcInfo = provider("Provider for cc_info for protos", fields = ["cc_info"])
 
 _WrappedDefsGeneratedSrcsInfo = provider(