Update rules_java v8.0.0-rc2 & stop exporting the java rules from `@_builtins`

 - keeps the native stub definitions for now
 - cleanup of the rules & updating to rules_java v8.0.0 will be in a followup

PiperOrigin-RevId: 682810444
Change-Id: I9dee6631697309af157655f0814532506e94cb2e
diff --git a/src/test/java/com/google/devtools/build/lib/testutil/TestConstants.java b/src/test/java/com/google/devtools/build/lib/testutil/TestConstants.java
index 1045324..72d2046 100644
--- a/src/test/java/com/google/devtools/build/lib/testutil/TestConstants.java
+++ b/src/test/java/com/google/devtools/build/lib/testutil/TestConstants.java
@@ -155,6 +155,7 @@
 
   public static final ImmutableList<String> PRODUCT_SPECIFIC_BUILD_LANG_OPTIONS =
       ImmutableList.of(
+          "--experimental_rule_extension_api",
           // Don't apply autoloads in unit tests, because not all repos are available
           "--incompatible_autoload_externally=");