[JENKINS-45841] - Disable JNLP/JNLP2/CLI protocols on new installations (#2950)

* [JENKINS-45841] - Disable JNLP/JNLP2/CLI protocols in the Setup Wizard

* [JENKINS-45841] - Implement deprecation data model for Agent protocols.

WiP

* [JENKINS-45841] - DeprecationCause is YAGNI, extend UI and document deprecated protocols

* [JENKINS-45841] - Fix the layouts

* [JENKINS-45841] - Add administrative monitor for deprecated protocols

* [JENKINS-45841] - Added Initializer check, polished the warning message

* [JENKINS-45841] - Add tests

* [JENKINS-45841] - Replace JNLP protocol links by jenkins.io redirects

* [JENKINS-45841] - Address comments from @jglick

* [JENKINS-45841] - Initializer checks status when Jenkins instance is not ready