Rewrite PEB and DS tests
Remove the existing broken tests of Partial Event Building and Data Scouting, and all the relevant files. Add new job options testing both functionalities and add two new tests using the JO - one with athena and one with athenaHLT.
The new JO is still missing the HLT result configuration part, as this requires some other developments to be done first (in separate MRs). Because of this, the new tests only test the menu infrastructure, and not yet the actual PEB/DS result building.