Use the TestFileDB everywhere instead of hardcoded paths on eos
Depends on lhcb-datapkg/PRConfig!484 (merged)
A reference update is needed for the following tests:
- Allen.mdf_input
- Allen.mdf_input_v3
- Allen.mdf_input_v4
These are all a result of more appropriate geometry or conditions versions being used. For the _vN
tests the change is very minimal. For the mdf_input
test the changes look good to me.