[TASK] Enable functional tests on microsoft sql server again

Executing functional tests on mssql has been disabled a while
ago since the daemon crashed frequently: The server can not
run on tmpfs volumes that we usually use to speed up database
operations. sql server uses O_DIRECT i/o system calls which
tmpfs does not support. Find details at
https://github.com/Microsoft/mssql-docker/issues/12

We now run mssql tests on hard disks again, but enable them
only as nightly since they are too slow as pre-merge tests.

Change-Id: Iefc61670dcf74012fcdaada8e5b771538e7cf8c3
Resolves: #85614
Releases: master
Reviewed-on: https://review.typo3.org/57641


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>