Added view_pin param. (#19788)

#19545

`/api/latest/fleet/hosts/:id/lock` returns `unlock_pin` for Apple hosts
when query parameter `view_pin=true` is set

The lock host activity now has a `view_pin` parameter. Frontend change
is needed to reflect this in the UI.

# Checklist for submitter

<!-- Note that API documentation changes are now addressed by the
product design team. -->

- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://fleetdm.com/docs/contributing/committing-changes#changes-files)
for more information.
- [x] Added/updated tests
- [x] Manual QA for all new/changed functionality

changes/19545-unlock-pin

@@ -1,2 +1,2 @@
-* /api/latest/fleet/hosts/:id/lock returns `unlock_pin` for Apple hosts
+* /api/latest/fleet/hosts/:id/lock returns `unlock_pin` for Apple hosts when query parameter `view_pin=true` is set
 * UI no longer uses unlock pending state for Apple hosts