XWIKI-14591: Discourage or prevent users to move/rename pages from Extensions

* Tell yui compressor to not remove the comment with the Velocity code when minifying the JavaScript
* The JavaScript/CSS files from xwiki-platform-web WAR are minified in place (we don't provide the unminified version).

XWIKI-15137: TemplateManager should not generate an empty RawBlock if the result of the template execution is empty

* fix tests

* improve test

* fix test

* Add license header.

XWIKI-15134: Page translations are not re-indexed when shared meta data is updated on the default translation

    XWIKI-14591: Discourage or prevent users to move/rename pages from Extensions

* Make sure we get the objects and attachments from the default traslation.

XWIKI-14591: Discourage or prevent users to move/rename pages from Extensions

XWIKI-15125: Introduce configuration to override/set the default UI

XWIKI-15060: Don't show notifications events for minor changes by default but allow to see them if need be.

* Make notifications preferences and filters changes as minor edits so we can benefit from this new feature (depends on XWIKI-15120)

This reverts commit fe20888c.
Reverted because of failing tests that showed the Preview continuously loading

XWIKI-15060: Don't show notifications events for minor changes by default but allow to see them if need be.

* Update javadoc so we can backport to stable-9.11.x

XWIKI-15060: Don't show notifications events for minor changes by default but allow to see them if need be.

- In order to be consistent in terms usage and styling