Remove `--incompatible_disallow_data_transition` flag

https://github.com/bazelbuild/bazel/issues/6153

RELNOTES: None.
PiperOrigin-RevId: 240442015
diff --git a/src/test/java/com/google/devtools/build/lib/skylark/SkylarkRuleClassFunctionsTest.java b/src/test/java/com/google/devtools/build/lib/skylark/SkylarkRuleClassFunctionsTest.java
index f14a303..382c7bb 100644
--- a/src/test/java/com/google/devtools/build/lib/skylark/SkylarkRuleClassFunctionsTest.java
+++ b/src/test/java/com/google/devtools/build/lib/skylark/SkylarkRuleClassFunctionsTest.java
@@ -594,17 +594,9 @@
 
   @Test
   public void incompatibleDataTransition() throws Exception {
-    ev =
-        createEvaluationTestCase(
-            StarlarkSemantics.DEFAULT_SEMANTICS
-                .toBuilder()
-                .incompatibleDisallowDataTransition(true)
-                .build());
-    ev.initialize();
     EvalException expected =
         assertThrows(EvalException.class, () -> eval("attr.label(cfg = 'data')"));
-    assertThat(expected).hasMessageThat().contains(
-        "Using cfg = \"data\" on an attribute is a noop and no longer supported");
+    assertThat(expected).hasMessageThat().contains("cfg must be either 'host' or 'target'");
   }
 
   @Test