wait-node-online and wait-node-offline covered by test-cases

* [JENKINS-34468] CLI command offline-node extracted from core to CLI

offline-node extended to accept multiple node names
offline-node covered by test-cases

* Fixed translation properties

* Fixes based on Oleg's comments

* Fixed HelpCommandTest test-case

* Minor fixes

* Uses Matchers.instanceOf everywhere instead of Java operator instanceof

quiet-down and cancel-quiet-down covered by test-cases

* Lithuanian translation update

* Lithuanian translation update

* [JENKINS-31417] CLI command connect-node extracted from core to CLI

connect-node extended to accept multiple node names
connect-node covered by test-cases

* Slighty modified Javadoc

* Fixed translations after rebase

reload-configuration covered by test-cases

disconnect-node extended to accept multiple node names
disconnect-node covered by test-cases

clear-queue covered by test-cases

online-node covered by test-cases

All Message_bg.properties files done - 654 strings.
Added MIT license to every new file.
Signed-off-by: NAlexander Shopov <ash@kambanaria.org>

Author:    Alexander Shopov <ash@kambanaria.org>

This makes the overall appearance of the page match what you would actually see from the console.
(Using: java -jar jenkins-cli.jar -s <URL> help <COMMAND>)
For some commands, such as SupportCommand (in support-core), this is critical,
since the expectation is that longDescription is a multiline fixed-width block.

(What is ${baseUrl}? ${rootURL} was meant.)