kie-remote: moving the /execute operation to its own resource class
(cherry picked from commit 8fd7ab26de7753b4b691504b73216a5c546e505b)
kie-remote-client: minor fixes
(cherry picked from commit 28032bc2ca29392cee7598d81d53423d6a5e93e3)
kie-remote-services: cleaned up tests
(cherry picked from commit c2921805ba3618bdaf8974c15e67f8a2b57a8580)