fix: change icon to symbol (#7229)

* fix: changed icon to symbol

* fix: covering every three states.

* fix: git merge

* chore: Clean-merge branches

* fix: changed trash symbol to delete

* Update core/src/main/resources/lib/hudson/editTypeIcon.jelly

Co-authored-by: Alexander Brandes <mc.cache@web.de>
Co-authored-by: Alexander Brandes <brandes.alexander@web.de>