[JENKINS-36923] Give ownership of bcpkix dependency to bouncycastle-apl plugin

- We are committed to this now that bouncycastle-api 2.16.0 has been released

* [FIXED JENKINS-34882] Honor non-default update sites during install

* Fix pluginSetupWizard tests

* Fix lint

- We now check the format and assure that all detached plugins are reported

Adding a few nullability annotations

[FIXED JENKINS-36922] Upgrade to instance-identity-module 2.0

[FIXED JENKINS-36732] Use build start times instead of build scheduled times in `BuildTimelineWidget`. (#2460)

Do not force the representation

- We migrate the bcpkix dependency from instance-identity to the war's WEB-INF/lib so that the net effect is zero and we are still not exposiing the bcpkix as a transitive dependency of jenkins-core

[JENKINS-34915] CLI commands wait-node-online/wait-node-offline extracted from core to CLI

[JENKINS-18435] Tell browsers not to cache or try to autocomplete forms

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

* no longer hard-code the icon for the executor panel

[FIXED JENKINS-36775]

* add documentation to Computer.java for custom icons

* add recommended implementation to the javadoc

* [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

* [JENKINS-36666] Properly report the reason for a failed call to Task.getDisplayName.

* [JENKINS-36666] Even without passing fatal=false to @Initializer, recover gracefully from a LinkageError in a task.

* Comment.

* [JENKINS-36748] Not process null Triggers

* [JENKINS-36748] Specify job

* [JENKINS-36748] Correctly check NullPointerException

Remove API restriction on UserDetailsCache

[JENKINS-35493] Introduce a UserDetails cache

Followup to #2446 to remove the API restriction
so that the first fix can potentially be picked
for LTS while this stays in the weekly release.