Check if user uploading External results is from same district

[Pranshu1902]

Proposed Changes

Before importing the External results from the CSV file, check whether each of those results belong to the same district as that of the uploading user

Associated Issue

Fixes #6650

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

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (8c633e2) 60.76% compared to head (ec7bbad) 60.74%.
Report is 5 commits behind head on master.

Files	Patch %	Lines
...are/facility/api/viewsets/patient_external_test.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1747      +/-   ##
==========================================
- Coverage   60.76%   60.74%   -0.03%     
==========================================
  Files         210      210              
  Lines       11530    11536       +6     
  Branches     1642     1646       +4     
==========================================
+ Hits         7006     7007       +1     
- Misses       4283     4288       +5     
  Partials      241      241              

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