Browser tab job updates

As with certain websites such as gmail, galaxy should have some way of alerting users who are using multiple tabs of job completions (or failures) in the tab box at the top of the screen.

Credit @martenson for the image.


No file, test, or entry point is identified. Start by locating the tab box at the top of the screen and the job completion and failure notifications; the work is done when users working in multiple tabs are alerted about both outcomes, consistent with the provided reference image.

Written by the indexing model from the issue text.