Fix hasPermissionForActivityType to use components function.

Fix hasPermissionForActivityType to use components function.

This is a refactor step - not the final destination. I want to move from loading
all activities & then checking if each one can be accessed to determining a list
of activity types and then adding that filter to the sql query. 2 reasons
- performance
- because getcount actually hard fails when permissions are applied currently :-(

In this step I note the function activityComponents looks like it expected
the concept of showActivitiesInCore by components to take off but in
practice it is hard coded to 0 for CiviCase & CiviCase only. Oddly there is
acually handling for CiviCase in this function in a place unreachable
without the changes in this patch. In addition the few places that call this
function also do weird CiviCase handling. I've opted for relatively low
intervention since I think most places that call this function
are likely to change themselves in the short-medium term.

note this implements https://lab.civicrm.org/dev/core/issues/454 which slightly downgrades the relevant permission