Avoid using the degraded ThreadGroup methods

This rule flags the use of the ThreadGroup.setDaemon, ThreadGroup.isDaemon, ThreadGroup.destroy and ThreadGroup.isDestroyed methods. These methods have been marked as deprecated for removal, and their behavior has been updated to the following:

• The destroy method does nothing.
• The isDestroyed method returns false.
• The setDaemon and isDaemon methods set/get a daemon status that is not used for anything.

For more information see JDK-8286768. JEP-425.