Move remaining test helper classes from core repo

[FIX JENKINS-15331] Windows file locking workaround

[JENKINS-32874] Improved test coverage of AbstractBuildRangeCommand

[JENKINS-34438] Activate JSHint during the build process

Deprecating Computer.cliOnline()

[FIXED JENKINS-33848] - Do not try to resolve empty strings in Items:fromNameList()

[JENKINS-33822] Create a new item using the keyboard

Functionality was moved to OnlineNodeCommand class already

Removed tab characters and 4-spaces indentantion

Upgrade to stapler 1.243 and some testcase fix.

Don't go through init sequence twice

Reduce logging level of some warnings to INFO

[JENKINS-33950] dependencies may be installed multiple times

[JENKINS-33948] - Always display clicked scrollspy items as active

[JENKINS-34494] enable required plugins during plugin installs

[JENKINS-32340] Enable disabled dependencies

Add pt_BR translations

required dependencies; this may still have some issues in unknown cases
such as a plugin disabled, then re-enabled without restarting Jenkins
but it fixes one of the primary cases

Stapler 1.241 adds _class element to generated JSON with the name of ExportedBean class, this
was failing couple tests in ApiTest.json(), where the tests were comparing fixed string json.

Switch on async-supported for Stapler and all Servlet Filters

Lithuanian translation update

[JENKINS-34448] Fixed offlineCause race condition

This picks up the new remoting with the upstream fix for Jenkins-33999
which allows spring Exceptions past the class blacklist

(cherry picked from commit 08fe459d)