Change: Use reusable workflow for Calens 

A new reusable workflow for calens changelog changes has been added to the current workflow in order to be used by all clients

https://github.com/owncloud/android/pull/4825
https://github.com/owncloud/android/pull/4826
https://github.com/owncloud/android/pull/4829
https://github.com/owncloud/android/pull/4853
