Bug 34468: Add progress callback to job_progress.js

Bug 34468: Add progress callback to job_progress.js

These patches change the current updateProgress function to accept a
progress callback (a function that is called every time the bar
progresses) in addition to the already existing callback that is called
when the progress bar finishes.

It's not expected to change any current behavior in master because
updateProgress is only used once in the stage marc import tool using
the already existing callback, and these patches aim to keep that.

Test Plan:
1) Apply this patch
2) Stage a marc batch ( preferrably a large one to show the progress
   updating )
3) Note the new progess bar, verify it functions correctly.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>