Flip --enable_workspace to false

- Most test cases have migrated from WORKSPACE to MODULE.bazel
- Some test cases still enable WORKSPACE because they test WORKSPACE functionalities.

Part of https://github.com/bazelbuild/bazel/pull/23253

Fixes https://github.com/bazelbuild/bazel/issues/19824
Working towards https://github.com/bazelbuild/bazel/issues/23023

PiperOrigin-RevId: 667901985
Change-Id: I35ee8050d835a62fed4cd7e6637bd0616766f3c4
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 2b6bfa3..8a62baa 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
@@ -160,7 +160,7 @@
       + " - deps(" + TOOLS_REPOSITORY + "//tools/cpp:grep-includes)";
 
   public static final String APPLE_PLATFORM_PATH = "build_bazel_apple_support/platforms";
-  public static final String APPLE_PLATFORM_PACKAGE_ROOT = "@build_bazel_apple_support//platforms";
+  public static final String APPLE_PLATFORM_PACKAGE_ROOT = "@@build_bazel_apple_support+//platforms";
   public static final String CONSTRAINTS_PACKAGE_ROOT = "@platforms//";
 
   public static final String PLATFORMS_PATH = "embedded_tools/platforms";