[FLINK-25885] Suppress error reporting for ResourceManagerServiceImpl…

….deregisterApplication

This commit suppresses the error reporting for ResourceManagerServiceImpl.deregisterApplication
in order to harden the ClusterEntrypointTest.testWorkingDirectoryIsDeletedIfApplicationCompletes.
This is a temporary fix until FLINK-25893 has been fixed.

This closes #18567.

flink-runtime/src/main/java/org/apache/flink/runtime/entrypoint/component/DispatcherResourceManagerComponent.java

@@ -128,7 +128,17 @@ public final CompletableFuture<ApplicationStatus> getShutDownFuture() {
  public CompletableFuture<Void> stopApplication(
  final ApplicationStatus applicationStatus, final @Nullable String diagnostics) {
  return internalShutdown(
- () -> resourceManagerService.deregisterApplication(applicationStatus, diagnostics));
+ () ->
+ resourceManagerService
+ .deregisterApplication(applicationStatus, diagnostics)
+ // suppress deregister exception because of FLINK-25893
+ .exceptionally(
+ exception -> {
+ LOG.warn(
+ "Could not properly deregister the application.",
+ exception);
+ return null;
+ }));
  }
 
  /**