fix prescriptions migration

[rithviknishad]

Proposed Changes

• Adds missing migration for file upload (added discharge summary option)
• Alter prescription fields to be nullable except medicine. (only dosage had to be made nullable, the rest was already done).
• Ensured serializer does proper validation (no code changes were required here).
• Reordered the migrations.
• Clean the existing prescription data while migrating.
• Skips creating the Prescription if Medicine is missing from old data.
• Alter medicine field: Increased length to 1023 (failed with 100 and 255).
• Rounds float values to the nearest int for integer fields (min hours between doses and days).
• Alter prescribed_by field: set null=True as consultation.created_by is also null=True.
• Detects which field is frequency and dosage and extracts values accordingly as shown in the screenshot.
  

Tested Migrations with a staging duplicate DB

@coronasafe/code-reviewers

Merge Checklist

• Tests added/fixed
• Update docs in /docs
• Linting Complete

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01 ⚠️

Comparison is base (041a75f) 56.72% compared to head (14174c2) 56.72%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1305      +/-   ##
==========================================
- Coverage   56.72%   56.72%   -0.01%     
==========================================
  Files         198      198              
  Lines        9840     9841       +1     
  Branches     1640     1641       +1     
==========================================
  Hits         5582     5582              
- Misses       4203     4204       +1     
  Partials       55       55              

Impacted Files	Coverage Δ
care/facility/models/prescription.py	82.35% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
1 Security Hotspot
6 Code Smells

No Coverage information
14.2% Duplication