MDL-62409 tool_dataprivacy: Properly validate data request creation
Creating data requests
* Add capability check when creating data requests for another user.
Ad-hoc task that processes pending data requests
* Check if the requesting user has the capability to create the data
request for another user. Reject otherwise.
Ad-hoc task that processes approved data requests
* Validate that the requester can receive the notification about the
data request processing results.
* Do not send the confirmation link to DPOs/admins