Increase allowed cancel delay in tests to reduce flakiness.

Currently we rarely pass this on Forge but with upcoming changes I see 2-3% flakiness and I mostly concluded at this point they are just GC noise.

PiperOrigin-RevId: 725703352

transpiler/javatests/com/google/j2cl/transpiler/TranspilerTester.java

@@ -480,8 +480,11 @@ private static boolean compare(String actual, String expected) {
     }
   }
 
-  /** The maximum delay (in ms) that we allow for calls to #isCancelled(). */
-  private static final int MAX_DELAY = 200;
+  /**
+   * The maximum delay (in ms) that we allow for calls to #isCancelled(). Note that we have a much
+   * lower delay but this number should be high enough to cover random GC events.
+   */
+  private static final int MAX_DELAY = 250;
 
   private static Problems transpile(ImmutableList<String> args) {
     List<String> delayedCalls = new ArrayList<>();