LP#1954681 Individual overrides when placing multiple holds

LP#1954681 Individual overrides when placing multiple holds

This adds an override all button above the override column if
there are multiple overridable holds (Angular Staff Catalog).

To test:
1. Ensure staff has permission to CREATE_DUPLICATE_HOLDS
   and HOLD_ITEM_CHECKED_OUT.override
2. Set org setting for Maximum number of duplicate holds allowed
   to a value greater than 1
3. Check out an item to a patron
4. Try to place a hold on that item with Number of copies set
   to a value greater than 1
5. Test that the Override All button appears and works

Signed-off-by: Dan Briem <dbriem@wlsmail.org>