[BugFix] Fix the incomplete ok semantic in runPendingJob (#9160)

The code paths will not enter the right branch when the status of countDownLatch is not ok. If BE failed to create tablet, runPendingJob will transform to next phase as normal, it's not ok. Instead this case should throw an AlterCancelException.

fe/fe-core/src/main/java/com/starrocks/alter/SchemaChangeJobV2.java

@@ -308,7 +308,7 @@ protected void runPendingJob() throws AlterCancelException {
                     Config.max_create_table_timeout_second * 1000L);
             boolean ok = false;
             try {
-                ok = countDownLatch.await(timeout, TimeUnit.MILLISECONDS);
+                ok = countDownLatch.await(timeout, TimeUnit.MILLISECONDS) && countDownLatch.getStatus().ok();
             } catch (InterruptedException e) {
                 LOG.warn("InterruptedException: ", e);
                 ok = false;