* JENKINS-53353 Do not cache results of View.getActions()

Plugins that may affect the view, eg via TransientViewActionFactory
that get installed _after_ a `view` has been initally viewed
will not be able to add anything to the view if the results
of getActions() are cached.

* JENKINS-53353 Removed unnecessary synchronization

* JENKINS-53353 Whitespace

* JENKINS-53353 Restored (and deprecated) updateTransientActions

to maintain backwards compatibility.

[JENKINS-46523] - Make UnixReflection class compatible with Java 11, remove pre-Java 8 reflection (#3650)

* [JENKINS-46523] - Make UnixReflection class compatble with Java 9+, remover pre-Java-8 code

Ideally this logic should be replaced by Multi-Release JAR

* [JENKINS-46523] - FindBugs annotations complicate the code here

* [JENKINS-53799 ] - Explicitly reference the JIRA ticket in the error message

[JENKINS-53721] - Add getter/setter to EnvVars so the envinject plugin can set Platform safely (#3639)

[JENKINS-53721] - Add getter/setter to EnvVars so the envinject plugin can set Platform safely

It is require to make the tests passing on Java 11, but apparently it also speeds up tests on Java 8.

It starts failing FindBugs runs against Java 11.
The implementation is not efficient, but it should not be a serious issue in this case

* Added Spanish translation for 'Build triggers' section in the UI

* Copyright changes to MIT license

* [JENKINS-53693] - Update PowerMock and Mockito to a Java11-compatible version

* [JENKINS-53693] - Fix tests which depend on mocking

* [JENKINS-53693] - Apply fixes to PowerMock

systËme -> système

* [JENKINS-53282] "Restarting VM as requested" should be just an INFO message

Previously logged as severe was I think incorrect, as it was simply
reacting on "standard" user interaction.
`INFO` ought to be enough because anyway, that's the default logged level,
hence will still be seen by admins if needed.

Side note: there's clearly duplications of code here.
I might address it later, but do not want to right now transform a 5 min
task into a much riskier one.

* Also lower log severity when shutting down after user request

* Fixed encoding

* Fixed encoding