[RTADPA BW Tests] New Sprucing bandwidth test using latest-available HLT2 input.

cc: @rjhunter.

related to: lhcb/Moore!2763 (merged) + lhcb-core/LHCbPR2HD!270 (merged) + lhcb-core/LHCbNightlyConf!1121 (merged)

Changes:

Adds a new sprucing test, Moore_spruce_latest_bandwidth, which uses the Hlt2 nominal full-stream output which was uploaded to eos on the previous day.

Added a new script, generate_hlt2_fullstream_metadata.py, which runs only for Hlt2 nominal tests and writes the metadata.yaml based on information from the full-stream output of the test currently running. This metadata.yaml is used as an input config for the new sprucing test.

• a little safety around division in zero from the calculation of overlap_matrix, never comes up in the actual tests because every stream has a non-zero retention in 100k events, but when running test jobs it can come up and it was annoying me.

• changes to facilitate the new test + metadata.

ToDo:

• Maybe revisit the N_EVTS and calculate via a gaudipython job?
  • Wait to see if BWTesters know a way to tell the N_EVTS available in a file.
  • Else, adapt list_event_numbers to extract the N_EVTS by iterating a gaudipython job.
• Rebase after !362 (merged) was merged

Closes #12 (closed)