Expand validate output to display link for downloading json with submission errors

[northwestwitch]

This PR adds | fixes:

• Fix Change validate endpoint to show detailed submission errors #120

@dnil FIY

How to test:

• Use validate endpoint with a submission that you know contains errors

Expected outcome:

• The json data returned from ClinVar should return a link to download the file with the submission data analysis

Review:

• Code approved by
• Tests executed by CR

This version is a:

• MAJOR - when you make incompatible API changes
• MINOR - when you add functionality in a backwards compatible manner
• PATCH - when you make backwards compatible bug fixes or documentation/instructions

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.10%. Comparing base (ef00987) to head (9cd2ab5).
Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #121      +/-   ##
==========================================
+ Coverage   95.02%   95.10%   +0.08%     
==========================================
  Files          11       11              
  Lines         462      470       +8     
==========================================
+ Hits          439      447       +8     
  Misses         23       23              

Flag	Coverage Δ
unittests	95.10% <100.00%> (+0.08%)	⬆️

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[northwestwitch]

Tested locally: ✅