google#2130 - Stop skipping certain tests under Windows

While on local machine the test cases took roughly similar times both on Windows and on Unix, on GitHub CI the tests under Windows took more than 1 hour (!). Keeping two test cases excluded that were previously measured to be slow.

guava-tests/test/com/google/common/util/concurrent/AbstractFutureTest.java

@@ -437,6 +437,9 @@ public void run() {
    */
 
   public void testFutureBash() {
+    if (isWindows()) {
+      return; // TODO: b/136041958 - Running very slowly on Windows.
+    }
     final CyclicBarrier barrier =
         new CyclicBarrier(
             6 // for the setter threads
@@ -618,6 +621,9 @@ public void run() {
 
   // setFuture and cancel() interact in more complicated ways than the other setters.
   public void testSetFutureCancelBash() {
+    if (isWindows()) {
+      return; // TODO: b/136041958 - Running very slowly on Windows.
+    }
     final int size = 50;
     final CyclicBarrier barrier =
         new CyclicBarrier(
@@ -1326,4 +1332,8 @@ protected void interruptTask() {
       interruptTaskWasCalled = true;
     }
   }
+
+  private static boolean isWindows() {
+    return OS_NAME.value().startsWith("Windows");
+  }
 }