MINOR: StoreChangelogReaderTest fails with log-level DEBUG (#14300)

A mocked method is executed unexpectedly when we enable DEBUG
log level, leading to confusing test failures during debugging.
Since the log message itself seems useful, we adapt the test
to take the additional mocked method call into account).

Reviewer: Bruno Cadonna <cadonna@apache.org>

streams/src/test/java/org/apache/kafka/streams/processor/internals/StoreChangelogReaderTest.java

@@ -520,7 +520,11 @@ public class StoreChangelogReaderTest extends EasyMockSupport {
     public void shouldRestoreFromBeginningAndCheckCompletion() {
         final TaskId taskId = new TaskId(0, 0);
 
-        EasyMock.expect(storeMetadata.offset()).andReturn(null).andReturn(9L).anyTimes();
+        if (type == STANDBY && logContext.logger(StoreChangelogReader.class).isDebugEnabled()) {
+            EasyMock.expect(storeMetadata.offset()).andReturn(null).andReturn(null).andReturn(9L).anyTimes();
+        } else {
+            EasyMock.expect(storeMetadata.offset()).andReturn(null).andReturn(9L).anyTimes();
+        }
         EasyMock.expect(stateManager.changelogOffsets()).andReturn(singletonMap(tp, 5L));
         EasyMock.expect(stateManager.taskId()).andReturn(taskId).anyTimes();
         EasyMock.replay(stateManager, storeMetadata, store);