MDL-29409 repository_alfresco: Drop support for URL/link

The current solution has two major issues. Firstly, it is using the
session key in the file URL, allowing anyone with the link to steal
the identify of the poster. Secondly, the links are not presistent
and become broken as soon as the server is restarted. Let's not
support this any more until a proper solution is found in MDL-26454.
MDL-40872 Restore functionality of showrecentsubmissions setting
MDL-44258 Behat test for workshop, automate MDLQA-99
MDL-40843 behat: allow to specify grouping by idnumber in module generator
MDL-40843 behat: step definitions for recent activity block and report
MDL-40843 recent_activity: corrections to grouping and user fields
MDL-40843 quiz: behat test for recent activity
MDL-40843 feedback: behat test for recent activity
MDL-40843 behat: tests for recent activity