Signed-off-by: Nolivier lamy <olamy@apache.org>

Signed-off-by: Nolivier lamy <olamy@apache.org>

[JENKINS-52285] - Update to Extras Executable WAR, permit running with Java 11 without feature flags (#3882)

* [JENKINS-52285] - Update to Extras Executable WAR, permit running with Java 11 without feature flags

https://github.com/jenkinsci/extras-executable-war/pull/22

* [JENKINS-52285] - Use the released version of the component

Picking up https://github.com/jenkinsci/ssh-cli-auth-module/pull/6 (Incrementals publisher not working there for some reason).

[JENKINS-55978] - Update SSHD Module to 2.6 to pick up the Apache MINA idle timeout custom property fix

* Move detached plugins logic into a dedicated class

ClassicPluginStrategy is already long enough, so trying to make things a
bit more focused before adding Java 11 logic. (and even if not, the change
still splits a class that is almost 1k lines).

* Install jaxb as detached only on Java 11+

* Remove duplicate @Restricted

Given the enclosing class already has it.

* Use 1.5 release

* Add more test coverage

* getMinJavaVersion => getMinimumJavaVersion

* Rename DetachedPluginsManager as DetachedPluginsUtil

as requested by Oleg and Jesse. Mainly because of the misleading
relationship (there's no inheritance) with the existing `PluginManager`
class.

* 🤦 adjust to 1.5 release method renaming

* Clarify minimum Java version column
Co-Authored-By: Nbatmat <bmathus@gmail.com>

* Update to 2.3.0 version of the jaxb plugin

* Bump minimum core version to next expected release version

* Add preventive cycle breaks for jaxb while waiting for JENKINS-28942

As requested by Oleg.

* Add test to fail fast on wrong format for split-plugins.txt