(cherry picked from commit b9a23fe7)

Co-authored-by: Dorian OUAKLI <132468278+douakli@users.noreply.github.com>
Co-authored-by: Manuel Leduc <manuel.leduc@xwiki.com>
Co-authored-by: Manuel Leduc <manuel.leduc@xwiki.com>
Co-authored-by: Marius Dumitru Florea <marius@xwiki.com>
Co-authored-by: Michael Hamann <michael.hamann@xwiki.com>
Co-authored-by: Nikita Petrenko <petrenkonikserg@gmail.com>
Co-authored-by: Simon Urli <simon.urli@xwiki.com>
Co-authored-by: Simpel <git@simpel.cc>

(cherry picked from commit f5bee5f7)

* Replace the xwikiHost configuration with xwikiURI in order to allow specifying the scheme/protocol and port number besides the domain name or IP address.

(cherry picked from commit d13789c6)

XWIKI-21170: Improve the error message shown when the PDF export size limit is exceeded
XWIKI-20881: Don't enforce the size limit on single page PDF exports

(cherry picked from commit ca36bac4)

* Cache failures
* Properly dispose the caches
* Only send requests to trusted domains
* Only embed actual images
* Limit responses to 1MB
* Introduce configuration options for timeout, maximum size and if the
  feature is enabled at all
* Add a UI test that checks that attachment embedding is working in
  general
* Move to httpclient5
* Expose the cookie domains configuration in AuthenticationConfiguration

(cherry picked from commit bff0203e)

XWIKI-20937: Add support for configuring an user property to be displayed as hint by the user picker

(cherry picked from commit cb64b6a2)

Co-authored-by: Michael Hamann <michael.hamann@xwiki.com>
Co-authored-by: Nikita Petrenko <petrenkonikserg@gmail.com>

[Misc] Update minimal java version to 11 + add warning only when java > 17 (since Java 17 is the LTS and we support it now)

* update documentation

(cherry picked from commit 6cf57219)

[Misc] Removing reference to XRENDERING-616 now that it's closed + Removing bad "--add-opens" (java.concurrent doesn't exist, it's java.util.concurrent), already covered by the open on "java.util"

[Misc] Removing bad "--add-opens" (java.concurrent doesn't exist, it's java.util.concurrent), already covered by the open on "java.util"