Add support for aborting slots
This MR introduces support for "aborted" slots (see LBCORE-1968).
The new Abort button is available in the slot table header. When clicked (and confirmed) the slot is flagged as aborted by adding the "aborted" entry in the database document:
"aborted": {"user": "somebody", "time": "2021-06-13 ..."}
at this point the page is reloaded and the slot looks like this:
By itself, this change doesn't mean much as I still have to instrument the nightly build scripts to actually stop once they detect the "aborted" flag.
/cc @rmatev
Edited by Marco Clemencic