Run a test under more environments.

It hasn't actually used "mocks" in the sense of "things from a mocking framework" since cl/85631779, which (confusingly) appears to have been the CL that _added_ the "mocks" comment (to replace a previous `@GwtIncompatible` comment about `withFallback`, which wasn't available under GWT until then). (Probably the author had switched away from using a mocking framework during development but then forgotten to remove `@GwtIncompatible` afterward.) It looks like I carried that comment over from `withFallback` to `catchingAsync` in cl/86180055, and then I added a corresponding TODO in cl/116759522. None of that seems to have been necessary.

RELNOTES=n/a
PiperOrigin-RevId: 723210249

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

@@ -1015,9 +1015,6 @@ public void testCatchingAsync_resultCancelledBeforeFallback() throws Exception {
     assertFalse(primary.wasInterrupted());
   }
 
-  @J2ktIncompatible
-  @GwtIncompatible // mocks
-  // TODO(cpovirk): eliminate use of mocks
   public void testCatchingAsync_resultCancelledAfterFallback() throws Exception {
     final SettableFuture<Integer> secondary = SettableFuture.create();
     final RuntimeException raisedException = new RuntimeException();

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

@@ -1015,9 +1015,6 @@ public void testCatchingAsync_resultCancelledBeforeFallback() throws Exception {
     assertFalse(primary.wasInterrupted());
   }
 
-  @J2ktIncompatible
-  @GwtIncompatible // mocks
-  // TODO(cpovirk): eliminate use of mocks
   public void testCatchingAsync_resultCancelledAfterFallback() throws Exception {
     final SettableFuture<Integer> secondary = SettableFuture.create();
     final RuntimeException raisedException = new RuntimeException();