[RTA/DPA BW tests] Fix HLT1 bandwidth test: use HLT1 input MDFs on eos rather than from the GRID for more I/O stability

Goes with lhcb-datapkg/PRConfig!379 (merged)

FYI @lugrazet

AllenInMoore_hlt1_bandwidth is currently down for file-authentication issues when it tries to download input files from the GRID, but seems to be happily downloading files from eos (see Jenkins log here). Other BW tests configured in the same way are passing and they also feature downloading from eos, so seems to be a GRID-related problem. Whether transient or not, moving to use files on eos probably makes us more robust against this, and should fix the test.

Checked locally that this (including the download) works and gives compatible results to the previous working test. on LHCbPR.