added tests for patient transfer

[DraKen0009]

Proposed Changes

• Added extra tests to improve test coverage of patients
• Updated fetching of facility to raise a 404 instead of raising a db error

Associated Issue

• Fixes Improve tests for Patient Transfer #2063

Merge Checklist

• Tests added/fixed
• Linting Complete

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 69.26%. Comparing base (39c7aa4) to head (6b3ff42).
Report is 7 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2564      +/-   ##
===========================================
+ Coverage    69.19%   69.26%   +0.06%     
===========================================
  Files          211      211              
  Lines        11940    11940              
  Branches      1208     1208              
===========================================
+ Hits          8262     8270       +8     
+ Misses        3302     3297       -5     
+ Partials       376      373       -3     

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