Top-priority followup from #9339, spun out of #9418

Batch mode be visible to all who can see the module, as it is currently.
It's designed for the dev/DCC team to handle and update issues -- End Users of Loris shouldn't be able to see / use Batch mode.

what to do:

• Hide the Batch Mode button unless the user has issue_tracker_developer permission

Consider doing #9423 at the same time - correct the button style

If time / nice to have: make sure the batch page doesn't load if the user doesn't have issue_tracker_developer

This solves the requirement for a permission restricting access, clearly defined in the original issue, and it was simply not done yet.
I don't want this to block #9339 but it is still important and should be the next PR after #9339.

@ay-bh please follow up with @racostas to ensure we are addressing this as a priority next PR, thank you very much