* replaced integer with AtomicInteger to fix spotbugs issue

* added @Restricted to prevent further usage

* replaced volatile with final because of AtomicInteger usage

* implemented a getter and an increment method

* fixed typeo in javadoc

Adding some nullability annotations related to Label

* [JENKINS-59656] when stopping a Run via the executors widget, make sure it's the intended one

* [JENKINS-59656] added Executor.stopBuild(String) instead of .stop(String)

* revert change to deprecated doStop(StaplerRequest,StaplerResponse), useless now that it's doStopBuild(String) which takes a runExtId parameter

* javadoc: "@since TODO" rather than "@since 2.???"

* [JENKINS-59656] added test case

* jelly cleanup with h.urlEncode(String)

* make Functions.urlEncode(null) return empty String

* Executor.doStopBuild(runExtId): ignore runExtId if executable is not a Run

* Executor.doStopBuild(runExtId) doesn't have to be a public API

Minor test code cleanup

[JENKINS-60357] Use XMLUnit to fix test

Adapt some tests to newer Jetty

merged superfluous if with while loop

Co-Authored-By: NZbynek Konecny <zbynek1729@gmail.com>

Fix online example/documentation for File Access Rules

[JENKINS-60278] Prevent Oops when Whitelisted Commands input is empty

[JENKINS-57304] - Add call to oneOffExecutors.remove in Computer.removeExecutor

* [JENKINS-6798] Redirect on HTTP >= 502 (502, 503, 504)

When Jenkins is behind a reverse proxy and is not available or
restarting, the reverse proxy will answer a HTTP 502 (because the upstream
doesn't answer).

* Add upper bound

Jenkinsfile: Use -ntp in the Maven Build

Removed some redundant constructs

Race condition in PlainCLIProtocolTest

Update bundled script-security to 1.68

removed some redundant constructs and replaced stringbuilder operations with too few arguments with string concatenation

Replaced deprecated getActiveInstance() with get()