Inventory - Permissions. View Instance records which are marked as Staff suppress

Following up on @Cate Boerema's comment in MODINV-167, I have reassigned this story to the Core Functional team.

CC: @Khalilah Gambrell

Moving this issue to the backlog. cc: @Tetyana Afanasyeva and @Oleksandr Antonenko

I was unaware of MODINV-167.

My comment was in the context of PR #735 which implements this permission as an exact copy of ui-inventory.instance.view. IOW, because there is no back-end support for this kind of permission (an instance record is an instance record is an instance record; it doesn't matter whether its staff_suppress value is "true" or "false" any more than if its title field is "Hamlet" or "Bill and Ted's Excellent Adventure"; they're all just instance records from the point of view of permissions), the only possible implementation I considered was constructing different queries based on the presence or absence of this permission.

If we're going to handle this on the backend, that's great ... but the same issue applies, it just moves the responsibility for all the work to construct such queries to the backend.

@Zak Burke As is being discussed on [MODINV-167], I think there will need to be a difference on the server side. Or are you proposing client side filtering of the records?

It's important to note that they way this feature is implemented in the backend, there is no difference in the actual, server-enforced permissions between the psets "Inventory: View instances, holdings, and items" and "Inventory: View instance records being suppressed for staff". When a user views records without the latter pset, we will have to change those queries to filter out the suppressed records.