Dropped age column from patient registration and annotated age in patient viewset

[rithviknishad]

Proposed Changes

• Dropped DB field age from Patient Registration
• Adds field death_datetime in Patient Registration
• Custom Migration to copy last_consultation's death_datetime to patient registration if present
• Updated consultation save method to update patient registration's death_datetime too if consultation has death_datetime.
• Annotated patient viewset with age to calculate age based on data of birth/year of birth up to date of death or now.

Associated Issue

• Incorrect representation of Patient Age care_fe#7383
• FE: Add Age field in patient registration care_fe#7411

Note

Custom Migrations

• Populates PatientRegistration.death_datetime with instance.last_consultation.death_datetime if present.

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: Patch coverage is 73.07692% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 62.58%. Comparing base (fa46f2f) to head (5bd404a).

Files	Patch %	Lines
care/facility/models/patient_icmr.py	44.44%	5 Missing ⚠️
care/facility/api/serializers/patient.py	66.66%	1 Missing ⚠️
care/facility/models/patient.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1966      +/-   ##
===========================================
+ Coverage    62.54%   62.58%   +0.04%     
===========================================
  Files          223      223              
  Lines        12270    12271       +1     
  Branches      1752     1750       -2     
===========================================
+ Hits          7674     7680       +6     
+ Misses        4274     4269       -5     
  Partials       322      322              

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[nihal467]

LGTM