fixes something went wrong error for duplicate patient no. check for OP consultations and imrpove error message

[rithviknishad]

Proposed Changes

• Raise validation error for duplicate patient no. check also for OP consultations (so far caused 500 as it was a DB constraint
• Improve error message

Associated Issue

• Fixes Modify the Error in Consultation form to be self explanatory  care_fe#7410

Architecture changes

• Remove this section if not used

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 62.20%. Comparing base (8616f5c) to head (51ce81e).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1974   +/-   ##
========================================
  Coverage    62.19%   62.20%           
========================================
  Files          221      221           
  Lines        12203    12204    +1     
  Branches      1742     1742           
========================================
+ Hits          7590     7591    +1     
  Misses        4305     4305           
  Partials       308      308           

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[nihal467]

LGTM