(cherry picked from commit 09722a98)

(cherry picked from commit d8a13ac0)

(cherry picked from commit 758c0ced)

[JENKINS-31932] avoid synchronization for Jenkinsget/setJDKs
(cherry picked from commit 0a5b0368)

[FIXED JENKINS-31219] A CloudProvisioningListener can prevent provisioning of all clouds instead of just the targeted cloud

(cherry picked from commit cc932c49)

This change adds code to check that the user isn't attempting to rename
an existing node with the name of another existing node.  Previous to
this change, such rename operations would succeed and would corrupt node
configuration data.

(cherry picked from commit 16d6429c)

(cherry picked from commit 8f012d63)

[FIXED JENKINS-31954] Stack overflow reconfiguring some settings where Descriptor.newInstance is gratuitously overridden.

Ensure that no warnings appear during startup

Deprecating subclassing of Plugin

[JENKINS-31395] Footer does not work fine in some situations

[JENKINS-31776] CLI command online-node extracted from core to CLI

JENKINS-29059: Display cron run times after warnings if warnings occur.

[JENKINS-30914] Add extra logging to the queue

Routine errors listening for UDP broadcast or DNS multicast should not print stack traces to the log.

online-node covered by test-cases