KAFKA-17575 Remove unnecessary file.deleteOnExit call (apache#17226)

TestUtils.tempDirectory already registers a shutdown hook for deleting the temp directory. There's no reason to also call File.deleteOnExit, since that just registers another hook to do the same thing.

Reviewers: TengYao Chi <[email protected]>, Ken Huang <[email protected]>, Chia-Ping Tsai <[email protected]>

clients/src/test/java/org/apache/kafka/test/TestUtils.java

@@ -268,7 +268,6 @@ public static File tempDirectory(final Path parent, String prefix) {
         } catch (final IOException ex) {
             throw new RuntimeException("Failed to create a temp dir", ex);
         }
-        file.deleteOnExit();
 
         Exit.addShutdownHook("delete-temp-file-shutdown-hook", () -> {
             try {