[FIXED JENKINS-36280] Enable DescriptorVisibilityFilter for Slave's C…

* [FIXED JENKINS-35906] Ensure that SCMDescriptor.newInstance overrides are honored.

* [FIXED JENKINS-36043] Work around fragile form submission design in multi-branch-project-plugin.

* [FIXED JENKINS-36232] NPE during SCM polling

* add test to trigger the "no veto" code path that has the NPE

* incorporate remark on using @Issue reference

Make BulkChange auto-closeable

Without it version of optional dependencies is set to "X.Y;resolution:=optional" which causes problems when using hudson.util.VersionNumber comparison methods.

Tests did not match naming pattern so were never being executed

The tests pass locally, but they will not run until #2429 is merged

Divergence introduced with 117d69b8.

so that it can be used as below:

    try (BulkChange bc = new BulkChange(o)) {
       ...
       bc.commit();
    }

[FIXED JENKINS-36280] Enable DescriptorVisibilityFilter for Slave's ComputerLauncher, RetentionStrategy and NodeProperty

[FIXED JENKINS-36123] Add an extension point that allows plugins to veto polling

Better exception message if a SecurityRealm doesn't respect the API contract and return null (#2407)

* Getter exception message if the SecurityRealm doesn't respect the API contract and return null.

* Use NullPointerException instead of IllegalStateException to not change the behaviour of the method.

* [JENKINS-33600] - User#isIdOrFullnameAllowed() should be tolerant against null parameters

* [JENKINS-33600] - Add the follow-up TODO

Changes summary:

Fixed issues:
* [JENKINS-22722](https://issues.jenkins-ci.org/browse/JENKINS-22722) - 
Make the channel reader tolerant against Socket timeouts. 
(https://github.com/jenkinsci/remoting/pull/80)
* [JENKINS-32326](https://issues.jenkins-ci.org/browse/JENKINS-32326) - 
Support no_proxy environment variable. 
(https://github.com/jenkinsci/remoting/pull/84)
* [JENKINS-35190](https://issues.jenkins-ci.org/browse/JENKINS-35190)  - 
Do not invoke PingFailureAnalyzer for agent=>master ping failures. 
(https://github.com/jenkinsci/remoting/pull/85)
* [JENKINS-31256](https://issues.jenkins-ci.org/browse/JENKINS-31256) - 
 <code>hudson.Remoting.Engine#waitForServerToBack</code> now uses credentials for connection. 
(https://github.com/jenkinsci/remoting/pull/87)
* [JENKINS-35494](https://issues.jenkins-ci.org/browse/JENKINS-35494) - 
Fix issues in file management in <code>hudson.remoting.Launcher</code> (main executable class). 
(https://github.com/jenkinsci/remoting/pull/88)

Enhancements:
* Ensure a message is logged if remoting fails to override the default <code>ClassFilter</code>. 
(https://github.com/jenkinsci/remoting/pull/80)