* Moves enableDataFeed outside of MLPopover

If we accept our dispatch functions, enableDatafeed can be abstracted as
a pure function. The version bound to popover's dispatch functions is
now named 'handleJobStateChange', as that is the callback it's used for.

* Remove unused component state

We no longer deal with jobs in our local state; that's the
responsibility of the useSiemJobs hook

* Prevent user from initiating multiple job installations

When attempting to run a job from the ML Popover, if the job needs to
first be installed, we set the rest of the jobs to be "loading" while
installation is performed.

Without this change, if users are fast enough they can potentially
trigger multiple rule installations, which is undefined behavior and
leads to failures and bad state in our component.

* Remove unused import