Update Tomcat, Jetty, Undertow and Netty servers so that an SslBundle
is used to apply SSL configuration. Existing `Ssl` properties are
internally adapted to an `SslBundle` using the `WebServerSslBundle`
class. Additionally, if `Ssl.getBundle()` returns a non-null value the
the `SslBundles` bean will be used to find a registered bundle by name.
See gh-34814