Release Note: Deprecate JMX Management Applets for Removal

The Java Management Extension (JMX) Management Applet (m-let) feature is deprecated for removal in a future release as it is irrelevant to modern applications - the deprecated public classes in `javax.management.loading` are: `MLet, MLetContent, PrivateMLet, MLetMBean`.

This will have no impact on the JMX agent used for local and remote monitoring, the built-in instrumentation of the Java virtual machine, or tooling that uses JMX.