[JENKINS-70394] Move 'set node temporarily offline/online' buttons to app-bar (#7577)

* Move 'set node temporarily offline/online' buttons to app-bar

As describe in JENKINS-70394 are the to set the node temp. online/offline not clickable, because the offline-cause warning covers this buttons.

* PR review

* fix node name on built-in node page

* Move additional controls to app-bar

Co-authored-by: Tim Jacomb <timjacomb1@gmail.com>