kie-issues#1613: Migrate `CI :: Check license headers`  apache-rat v0.16.1 (#3144)

* Add license header

* .rat-excludes

* align naming with kie-issues#1613 ensemble

* moce licenses into single file

* LICENSE.txt -> LICENSE

* Remove NOTICE

* Add jstree, jquery in .rat-excludes

* NOTICE recreated

* List explicitely all files in the .rat-exclude

* Use apache-rat v0.16.1

* CI :: License headers