[FIXED JENKINS-25416][JENKINS-28790] Do not inject build variables into maven process optionally (#1976)

* [FIXED JENKINS-25416][JENKINS-28790] Do not inject build variables into maven process optionally

* [JENKINS-25416][JENKINS-28790] Fixed typo in test method name

* [JENKINS-25416][JENKINS-28790] Suggest alternatives in help

* [JENKINS-25416][JENKINS-28790] Use less hackish approach to preserving legacy behaviour

* [JENKINS-20187] - Handle growing files when creating a tar file.

* - Introduce try-with-resources
- Remove exception login
- Throw new exception with filename and addSuppresed

* Address jglick comments

[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