prevent starting of duplicate backup/restore jobs #572
Description
as pgmanage user I would like freshly added backup/restore job to be highlighted so it is easier to spot that the new job has in fact created and started.
Motivation:
When there are multiple past jobs present in the jobs list and the new item is added it is not easy to spot it (even though it always appears on the top)
This may lead users to click "backup/restore" button once again, starting another extra job.
The solution is to add a css-faded highlight effect to the newly created job list item (potentially with $primaryBlue color fading to regular color within 1 sec or so)
Additionally we can temporarily disable the backup/restore button (or ignore clicks on it)