Add `load()` statements for the builtin Bazel java rules

Loads are being added in preparation for moving the rules out of Bazel and into `rules_java`.

PiperOrigin-RevId: 621541265

java/internal/testing.bzl

@@ -2,6 +2,9 @@
 Generates a side-car JUnit suite test runner class for each
 input src.
 """
+
+load("@rules_java//java:defs.bzl", "java_library", "java_test")
+
 _template = """import org.junit.runners.Suite;
 import org.junit.runner.RunWith;
 
@@ -36,7 +39,7 @@ _gen_suite = rule(
 
 def junit_tests(name, srcs, data = [], deps = [], package_name = "com.google.protobuf", test_prefix = None, **kwargs):
     testlib_name = "%s_lib" % name
-    native.java_library(
+    java_library(
         name = testlib_name,
         srcs = srcs,
         deps = deps,
@@ -59,7 +62,7 @@ def junit_tests(name, srcs, data = [], deps = [], package_name = "com.google.pro
             package_name = package_name,
             outname = suite_name,
         )
-        native.java_test(
+        java_test(
             name = test_name,
             test_class = suite_name,
             srcs = [src] + [":" + suite_name],