Closes gh-16147

Closes gh-16146

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Closes gh-16113
Closes gh-16112
Closes gh-16111
Closes gh-15916
Closes gh-15689

This commit switches the default value for the `spring.jmx.enabled`
configuration property.
JMX is now disabled by default and can be enabled with
`spring.jmx.enabled=true`.

Closes gh-16090

* pr/16053:
  Polish "Add loadOnStartup property to EndpointServlet"
  Add loadOnStartup property to EndpointServlet