Previous work was about introducing strategies to group events for creating
composite events. This work is about strategies for chosing how many
mails should be sent for each composite event to notify by email.
Historically the strategy was hardcoded and consisted in putting all
composite events in the same email. Here we provide different
strategies: the previous one, but also a strategy allowing to send one
email per composite event, and another one allowing to send a separate
email specifically for mentions.

That work also improves previous API to use a clear UserReference
instead of a String which is vague.

Co-authored-by: Manuel Leduc <manuel.leduc@xwiki.com>
Co-authored-by: Thomas Mortagne <thomas.mortagne@xwiki.com>

XWIKI-17872: SharePageIT#shareByEmailWhenNoFromAddress and SharePageIT#shareByEmailWhenFromAddressSpecified are flickering
* Preload on initialization rather than on focus which has some bugs (on the selectize.js side)

XWIKI-19070: Change the notifications locations inclusion default: don't consider that the whole wiki is watched when nothing is watched

  * Fix existing integration test

* Escape dash in the pattern / regexp when it's not used to define a range
* Single character names are valid.

* Various code style and formatting fixes
* Test migrated to Junit 5

* remove unused imports

XWIKI-20901: Add automated test for "Export a revision of a page"

(cherry picked from commit d28e8feb)

XWIKI-19131: User activity stream in profile misses label for buttons "mark read" and "details" (#2201)

* Added attributes to the buttons.
* Removed the previously unused label.

XWIKI-19070: Change the notifications locations inclusion default: don't consider that the whole wiki is watched when nothing is watched

  * Fix mistake in condition

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

* Remove changes applied by mistake

* Fix bug (thanks to SonarQube)

* Take 2

XWIKI-20970: Upgrade to TestContainers 1.18.3

* Fix bug with the new API now throwing an exception

* Simply code now that getting rendering throws an exception (thanks Thomas)

* Add a checked exception to be able to handle errors better in the future
XWIKI-20954: HTML escapes displayed in the comment history when uploading an attachment

XWIKI-20954: HTML escapes displayed in the comment history when uploading an attachment

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