[RTADPA BW Tests] Use new exp24 minbias for AllenInMoore_Hlt1_Bandwidth test

Standalone, is required by: lhcb-datapkg/PRConfig!358 (merged)

Updates Hlt1Conf/tests/options/bandwidth option files from the previous 'stand-in' input to the exp24 minbias.
Changes download_mdfs to instead be a wrapper of download_files, to allow addition of download_digis with little/no duplication.

Pending developments in PRConfig, this is ready.

Hlt/Hlt1Conf/tests/options/bandwidth/hlt1_bandwidth_input.py

@@ -20,7 +20,14 @@ If updating, please also update hlt1_bandwidth.yaml
 
 from Moore import options
 
-options.input_type = 'MDF'
-options.set_input_and_conds_from_testfiledb(
-    'upgrade_Sept2022_minbias_0fb_md_mdf')
+options.input_type = 'ROOT'
+options.dddb_tag = "dddb-20231017"
+options.conddb_tag = "sim-20231017-vc-mu100"
+options.simulation = True
+options.data_type = 'Upgrade'
+options.input_raw_format = 0.5
 options.evt_max = 100
+options.n_threads = 1
+options.input_files = [
+    'root://x509up_u16904@eoslhcb.cern.ch//eos/lhcb/grid/prod/lhcb/MC/Dev/DIGI/00204940/0000/00204940_00001476_1.digi'
+]