Refactor PluginManager advanced page handling a bit

[FIX JENKINS-38175] Fix various ManagementLink related bugs

* [FIX JENKINS-40494] Process warnings from update sites

* [JENKINS-40494] Address review comments

* [JENKINS-40494] Add warnings to available/update plugin manager tabs

* [JENKINS-40494] Add tests

* [JENKINS-40494] Address review feedback

Update a reference to "Agent => Master Access Control"

* [JENKINS-40470] Jobs didn't finish on Solaris 11 Intel node

* make length limit a system property

* Stop warning about not keeping undefined parameters

* Add javadoc on dontKeepUndefinedParameters parameter

* keepUndefinedParameters become a three state flag, remove dontKeepUndefinedParameters

* Add missing backtick in log message, reword the keepUndefinedParameters log

[FIXED JENKINS-40863] Don't use javax.servlet imports for remoting call

[JENKINS-40290] Fix test failing on Windows because of line feed assumption

Replace hard-coded links to the wiki with redirect links through jenkins.io

Signed-off-by: Kanstantsin Shautsou <kanstantsin.sha@gmail.com>

Fix a minor typo typos in the JNLP TCP Port help text

Add Windows build

This will allow easy redirection as our documentation efforts progress

See also jenkins-infra/jenkins.io#521

Considering all the verbiage updates that happened last year, this reference
appears to have been missed and as such can be confusing to newer users.

- In the context menu, the 'post' flag was set iff 'requiresConfirmation'
  was set, even though they're independent (e.g. Prepare for shutdown
  requires the former but not the latter)
- /manage screen: The icon (t:summary) does not support POST or
  confirmation links, but was set to not link only if no confirmation
  was required (i.e. POST links did not POST when the icon was clicked
  -- now the icon is not clickable as a workaround)
- /manage screen: All links requiring confirmation did POST, which masked
  the fact that the 'Reload from disk' link wasn't set up to require POST
  (it was only broken in the context menu). Now, confirmation and POST are
  separate flags, and 'Reload from disk' link now requests POST.

The line separator length was assumed to be 1 byte wide, although it
could be 2 on some platforms (aka Windows).

Polish translations

Fixes to Catalan translation

* [FIX JENKINS-39268] Properties are not passed to Maven command by Maven build step

* [FIX JENKINS-39268] Properties are not passed to Maven command by Maven build step

* [FIX JENKINS-39268] Properties are not passed to Maven command by Maven build step

* [FIX JENKINS-39268] Changed order in which properties are appended to command line: properties appended later win in case of conflicts

* [FIX JENKINS-39268] More precise messages in some assertions

* [FIX JENKINS-39268] Cleanup unused imports

* [FIX JENKINS-39268] Added functional tests for Maven task.