disable default jwks for production deployments

[sainak]

Proposed Changes

• if no key is speciied django will generate a new key, this causes issues with deployments with multiple instances of the backend
• in case of local environments instead of generating a new key on every startup, get/set the key from the file if not 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

@ohcnetwork/care-backend-maintainers @ohcnetwork/care-backend-admins

[codecov]

Codecov Report

Attention: Patch coverage is 54.54545% with 5 lines in your changes missing coverage. Please review.

Project coverage is 65.38%. Comparing base (00ce264) to head (d7177fa).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
care/utils/jwks/generate_jwk.py	54.54%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2414      +/-   ##
===========================================
- Coverage    65.42%   65.38%   -0.05%     
===========================================
  Files          242      242              
  Lines        13965    13976      +11     
  Branches      1935     1937       +2     
===========================================
+ Hits          9137     9138       +1     
- Misses        4445     4455      +10     
  Partials       383      383              

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