[JENKINS-39370] - Update Remoting in Jenkins core to 3.10 (#2886)

* Update Remoting in Jenkins core to 3.8

* JENKINS-39370 - Introduce support of Work Directories in remoting (opt-in).
* PR 129 - Allow configuring java.util.logging settings via a property file (-loggingConfig or JUL system property). See the Logging page for more details.
* JENKINS-37567 - Change of the code signing certificate

More info: https://github.com/jenkinsci/remoting/blob/master/CHANGELOG.md#38

* [JENKINS-39370] - Add direct tests for JNLP Launcher start with -workDir

* Pick Remoting 3.9

* Improve error message of LauncherTest#remoteKill()

* Update Remoting to 3.10