[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/qmtest/test_AllenInMoore_hlt1_bandwidth_streamless.qmt

+<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE extension  PUBLIC '-//QM/2.3/Extension//EN'  'http://www.codesourcery.com/qm/dtds/2.3/-//qm/2.3/extension//en.dtd'>
+<!--
+    (c) Copyright 2000-2023 CERN for the benefit of the LHCb Collaboration
+
+    This software is distributed under the terms of the GNU General Public
+    Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING".
+
+    In applying this licence, CERN does not waive the privileges and immunities
+    granted to it by virtue of its status as an Intergovernmental Organization
+    or submit itself to any jurisdiction.
+-->
+<!--
+Make sure the AllenInMoore HLT1 bandwidth test runs without errors for the streamless-stream configuration.
+NB: If adding new config files (e.g. muon_geometry) please inform: @lugrazet or @rjhunter @shunan)
+-->
+<extension class="GaudiTest.GaudiExeTest" kind="test">
+<argument name="program"><text>gaudirun.py</text></argument>
+<argument name="timeout"><integer>3600</integer></argument>
+<argument name="args"><set>
+  <text>$HLT1CONFROOT/tests/options/bandwidth/hlt1_bandwidth_input.py</text>
+  <text>$HLT2CONFROOT/tests/options/bandwidth/hlt1_bandwidth_streamless_streams.py</text>
+</set></argument>
+<argument name="options"><text>
+from Configurables import HiveDataBrokerSvc
+HiveDataBrokerSvc().OutputLevel = 5
+</text></argument>
+<argument name="use_temp_dir"><enumeral>true</enumeral></argument>
+<argument name="validator"><text>
+from GaudiTesting.BaseTest import LineSkipper
+from Moore.qmtest.exclusions import remove_known_warnings
+
+remove_known_warnings = remove_known_warnings + LineSkipper([
+    "WARNING Lifetime fit did not converge. Aborting.",
+    "WARNING Negative variance produced in lifetime fit iteration.",
+])
+countErrorLines({"FATAL": 0, "ERROR": 0, "WARNING": 0},
+                stdout=remove_known_warnings(stdout))
+
+import re
+matches = re.findall('LAZY_AND: (Hlt2[A-Za-z0-9_]+) .*Sum=(\d+)', stdout)
+if not matches:
+    causes.append('no line decisions found')
+
+</text></argument>
+<argument name="unsupported_platforms"><set>
+  <text>^(?!.*detdesc).*$</text>
+</set></argument>
+</extension>