Automated rollback of commit ac4741e.

*** Reason for rollback ***

We have already fixed the synchronization issue below in  bazelbuild@9e87ad0. So it is okay to re-enable LabelInterner for all tests.

*** Original change description ***

Automated rollback of commit 4626c37.

*** Reason for rollback ***

We have discovered a synchronization issue in `InMemoryNodeEntry`. See http://shortn/_4NfZ22pQ1L.

*** Original change description ***

Enable `LabelInterner` for all tests

This is part of the plan to fully test the `LabelInterner` feature before global release.

PiperOrigin-RevId: 528884695
Change-Id: I0973a21c6cd06e51342e9f55caaa028cf6f5f65f

src/main/java/com/google/devtools/build/skyframe/UsePooledLabelInterningFlag.java

@@ -13,6 +13,7 @@
 // limitations under the License.
 package com.google.devtools.build.skyframe;
 
+import com.google.devtools.build.lib.util.TestType;
 import java.util.Objects;
 
 /**
@@ -32,7 +33,8 @@
 public final class UsePooledLabelInterningFlag {
 
   private static final boolean USE_POOLED_LABEL_INTERNER =
-      Objects.equals(System.getProperty("BAZEL_USE_POOLED_LABEL_INTERNER"), "1");
+      Objects.equals(System.getProperty("BAZEL_USE_POOLED_LABEL_INTERNER"), "1")
+          || TestType.isInTest();
 
   public static boolean usePooledLabelInterningFlag() {
     return USE_POOLED_LABEL_INTERNER;