Exclude external_id from resources serializers

[rithviknishad]

Proposed Changes

• Exclude external_id from resources serializers as a duplicate of the serialized id field.

Associated Issue

• Fixes Request Response Includes Redundant external_id #1687

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 ✅

Comparison is base (1a232d7) 60.05% compared to head (8569641) 60.05%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1701   +/-   ##
=======================================
  Coverage   60.05%   60.05%           
=======================================
  Files         208      208           
  Lines       11325    11325           
  Branches     1607     1607           
=======================================
  Hits         6801     6801           
  Misses       4300     4300           
  Partials      224      224           

Files	Coverage Δ
care/facility/api/serializers/resources.py	47.36% <100.00%> (ø)

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