(cherry picked from commit bfa534ad)

(cherry picked from commit 723d20b4)

Co-authored-by: LucasC <lucas.charpentier@xwiki.com>
Co-authored-by: Marius Dumitru Florea <marius@xwiki.com>
Co-authored-by: Nikita Petrenko <petrenkonikserg@gmail.com>
Co-authored-by: Simon Urli <simon.urli@gmail.com>
Co-authored-by: Simon Urli <simon.urli@xwiki.com>
Co-authored-by: Simpel <git@simpel.cc>
Co-authored-by: Vincent Massol <vincent@massol.net>
Co-authored-by: xrichard <ldmpub@gmail.com>

* Better fix (the page should be there for all flavors)

* Fix page tests by moving DefaultDocumentRequiredRightsManager to
  oldcore so the implementation is available to tests that use the
  Document script API.
* Replace the XWiki.RequiredRightClass document by a mandatory document
  initializer.

XWIKI-22649: Error while rendering template [htmlheader.vm] when clicking on 'Forgot your username' and 'Forgot your password' making the templates unreachable

* found some information suggestion that "C.UTF-8" should work fine on Debian 10

* add some explanation on why we use this

This reverts commit cea21f9b.

This reverts commit 815fa52c.

XWIKI-22554: Java version verification not performed by XJetty startup script when running in non interactive mode
XWIKI-22555: XJetty startup script returns exit code 0 in case of failure
XWIKI-22556: XJetty systemd service run startup script in interactive mode

* Always use secure() (thanks to Thomas)

  * Add missing exclusions