Use new serializer for assets

[sainak]

Proposed Changes

• Brief of changes made.

Associated Issue

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Architecture changes

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Merge Checklist

• Tests added/fixed
• Update docs in /docs
• Linting Complete
• Any other necessary step

Only PR's with test cases included and passing lint and test pipelines will be reviewed

@coronasafe/care-backend-maintainers @coronasafe/care-backend-admins

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.82%. Comparing base (68a3a82) to head (8b1bde4).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2380      +/-   ##
===========================================
+ Coverage    63.80%   63.82%   +0.02%     
===========================================
  Files          239      239              
  Lines        13408    13416       +8     
  Branches      1909     1909              
===========================================
+ Hits          8555     8563       +8     
  Misses        4505     4505              
  Partials       348      348              

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