LP1956626 Copy editor loads all needed copy locations

LP1956626 Copy editor loads all needed copy locations

The item-location-select component now allows the caller to pass in a
set of context org unit IDs (in lieu of just a single id) for loading
copy locations across different areas of the org unit tree (without
having to load *all* copy locations).

Changes applied to the Angular copy location editor to pass the needed
context org units to the item location select component.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Jane Sandberg <sandbergja@gmail.com>