NEXTCLOUD_LOCAL_GROUP_USER_PASSWORD was not really telling what
kind of password we are setting. The new name makes it more clear
that the password is related to the AMPF feature.
* Adds FeatureDecision. Initial steps on SharePoint -> Sharepoint rename
* Update I18n keys to use sharepoint over share_point
* Adds handling of the drives on the file picker
* Upload Strategy handling plus FileLink Contract ammendment
* Add SharePoint storage validators and tests
Introduces authentication and storage configuration validators for SharePoint storage integration, including their registration in the connection validator. Adds corresponding RSpec tests and updates English locale messages for SharePoint validation errors. Also updates the environment example and storage factory for the SharePoint test configuration.
Jan Sandbrink