Bug 34137: Requested cancellation date column missing from holds awaiting pickup...

Bug 34137: Requested cancellation date column missing from holds awaiting pickup table config

This patch adds an entry for the requested cancellation date column to
columns_settings.yml so that the column can be configured correctly in
table settings and on the fly.

To test you will need at least one hold with a cancellation request:

- Go to Administration -> Circulation and fine rules -> Default waiting
  hold cancellation policy
  - Add at least one rule allowing cancellation on waiting items.
- Place a hold for a patron which would fall under the rule you defined.
- Satisfy the hold by checking the item in at the hold's destination
  location.
- Cancel the hold, either by logging in to the OPAC as the patron with
  the hold, or in the staff client via the holds tab on the patron's
  record.

- Apply the patch and restart all services.
- Go to Circulation -> Holds awaiting pickup
- In the "Holds with cancellation requests" tab, confirm that there is a
  "Date cancellation requested" column and that it is one of the choices
  under the "Columns" button.
- Confirm that the correct columns are shown and hidden when making
  selections in the columns menu.
- Go to Administration -> Table settings -> Circulation -> Holds
  awaiting pickup.
   - Test setting "Is hidden by default" and "Cannot be toggled" for
     various columns in the table, including the "Date cancellation
     requested" column.

Signed-off-by: Quinn <quinn.morris@citruslibraries.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>