Fix websocket connection retries logic

src/main/java/hudson/remoting/Engine.java

@@ -821,11 +821,11 @@ public void closeRead() throws IOException {
      * @return true if the condition succeeded, false if the condition failed and the timeout was reached
      * @throws InterruptedException if the thread was interrupted while waiting.
      */
-    private boolean succeedsWithRetries(SupplierThrowingException<Boolean> condition) throws InterruptedException {
+    private boolean succeedsWithRetries(java.util.concurrent.Callable<Boolean> condition) throws InterruptedException {
         var exponentialRetry = new ExponentialRetry(noReconnectAfter);
         while (exponentialRetry != null) {
             try {
-                if (condition.get()) {
+                if (condition.call()) {
                     return true;
                 }
             } catch (Exception x) {
@@ -903,19 +903,13 @@ ExponentialRetry next(EngineListenerSplitter events) throws InterruptedException
                 events.status("Bailing out after " + DurationFormatter.format(next.timeout));
                 return null;
             } else {
-                var delaySeconds = next.delay.toSeconds();
-                events.status("Waiting " + delaySeconds + " seconds before retry");
-                TimeUnit.SECONDS.sleep(delaySeconds);
+                events.status("Waiting " + DurationFormatter.format(next.delay) + " before retry");
+                TimeUnit.SECONDS.sleep(next.delay.toSeconds());
             }
             return next;
         }
     }
 
-    @FunctionalInterface
-    private interface SupplierThrowingException<T> {
-        T get() throws Exception;
-    }
-
     private void reconnect() {
         try {
             events.status("Performing onReconnect operation.");