[release-2.36.0][BEAM-13575] Sickbay test that is flaky to restore precommit test signal (#16410) (#16435)

Co-authored-by: Lukasz Cwik <lukecwik@gmail.com>

Author: emilymye

runners/flink/src/test/java/org/apache/beam/runners/flink/FlinkRequiresStableInputTest.java

@@ -51,6 +51,7 @@
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.ClassRule;
+import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.rules.TemporaryFolder;
 
@@ -120,6 +121,7 @@ public static void afterClass() throws Exception {
    * restore the savepoint to check if we produce impotent results.
    */
   @Test(timeout = 30_000)
+  @Ignore("BEAM-13575")
   public void testParDoRequiresStableInput() throws Exception {
     FlinkPipelineOptions options = FlinkPipelineOptions.defaults();
     options.setParallelism(1);