Limit minimum encounter date to 2020-01-01

[sainak]

This pull request adds a validation to ensure that the encounter date cannot be set to a date earlier than January 1, 2020. It also includes a test case to verify this validation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (00eea21) 61.68% compared to head (e589249) 61.69%.
Report is 1 commits behind head on master.

❗ Current head e589249 differs from pull request most recent head 9a9e030. Consider uploading reports for the commit 9a9e030 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1862      +/-   ##
==========================================
+ Coverage   61.68%   61.69%   +0.01%     
==========================================
  Files         212      212              
  Lines       11685    11689       +4     
  Branches     1657     1658       +1     
==========================================
+ Hits         7208     7212       +4     
  Misses       4180     4180              
  Partials      297      297              

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