Removes legacy beamsplitter files

[nquesada]

Legacy data that used to be needed to calculate beamsplitters in removed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.33%. Comparing base (9a9a352) to head (ca8de4a).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #730   +/-   ##
=======================================
  Coverage   98.33%   98.33%           
=======================================
  Files          78       78           
  Lines        9603     9603           
=======================================
  Hits         9443     9443           
  Misses        160      160           

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