XWIKI-18975: Merge conflict on XWiki.Notifications.Code.NotificationAdministration in some cases when upgrading to XWiki 13.7

  * Remove the xobjects wrongly committed in NotificationAdministration
    page: those objects are automatically created by
MandatoryDocumentInitializers.

XWIKI-18910: Errors appear in the wiki console after selecting the "Forgot your username or password option", on a Multilingual wiki (#1689)

  * Ensure to display the language menu only if $doc is defined in the
    current context.

- Improve the icons fetch mocking
- Introduce flush-promises to make it easier to wait for asynchronous tasks to be finished before the assertions

XWIKI-18957: Allow indicating for which attachments the content should be serialized in the instance input filter

[Misc] Try to work around the "Java heap space" issue when using the maven assembly plugin for building the hsqldb/jetty flavor. See https://tinyurl.com/45dzmyek
* Roll back the change to see if it helps with the "Killed" job issue

[Misc] Try to work around the "Java heap space" issue when using the maven assembly plugin for building the hsqldb/jetty flavor. See https://tinyurl.com/45dzmyek
* Reduce a bit the memory added since it seems this could be why we now have "Killed" builds in the CI...

* workaround a strange error in the integration tests

XWIKI-18976: Impossible to migrate deleted fs attachments from <9.10 when moving the permanent dir but the old one exist too

* forgot one case of invalidation

[Misc] Try to work around the "Java heap space" issue when using the maven assembly plugin for building the hsqldb/jetty flavor. See https://tinyurl.com/45dzmyek

* Enable local cache for tuning

This commits contains a set of small improvements aimed at speeding-up the rendering of tables with a large amount of properties to display.
This involves:
- not displaying components when possible by moving v-if statements from the callee to the caller
- prevent re-rendering of frequently instantiated components by using v-show
In addition, a tippy feature that we do not currently use is turned off.

[Misc] Add missing license header + reorganize a bit the content to align between commons, rendering and platform + add new ignore for XVNC (found thanks to Gradle Enterprise) + removed unused weblate section

* use simpler DocumentReference constructor

* make test more robust by working on the document
  actually stored in the (spy) xwiki instance

* improve and simplify the unit test

- store group property as LargeStringValue, not StringValue
- also use ListClass.getStringFromList to join the groups
  (which is more of a theoretical issue as the rights UI
  creates a separate RightsClass object for every group)

* Collect custom user data
* Secure publishing
* Add new GE ignore

XWIKI-18942: Rollback of a document version containing a different attachment with the same name and version does not work
* fix flicker