The only icons in hicolor here are pattern-* for yast-packager. Other icons are shipped with the module that uses them.
Oxygen and Crystal themes are still shipped, but pretty much deprecated due to lack of maintenance.
This is the fancy YaST theme used in the Qt installation workflow.
The openSUSE/wizard counterpart to SLE/wizard lives
in the yast directory of the openSUSE branding repository.
All icons will be stored in /usr/share/icons/.
/usr/share/icons/hicolor
/usr/share/icons/oxygen
/usr/share/icons/breeze/usr/share/icons/breeze-dark