fix for: api (and other things) possibly returning duplicate MediaAssets

[naknomum]

• enc.getMedia() did not check for duplicates in assets returned; now will not populate with duplicates
• fixes encounter api sometimes producing duplicate asset data

[erinz2020]

lgtm

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.61%. Comparing base (c391d50) to head (0f0ba66).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1403   +/-   ##
=======================================
  Coverage   51.61%   51.61%           
=======================================
  Files         308      308           
  Lines       11976    11976           
  Branches     3824     3824           
=======================================
  Hits         6182     6182           
  Misses       5507     5507           
  Partials      287      287           

Flag	Coverage Δ
backend	51.61% <ø> (ø)
frontend	51.61% <ø> (ø)

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