fix(app): Show file metadata for schema validator issues

[nellh]

Main issue is the map was being iterated over so keys and values were being displayed here. This iterates over the schema validator file issues and handles file metadata better.

Fixes #2995

[codecov]

Codecov Report

Attention: 18 lines in your changes are missing coverage. Please review.

Comparison is base (7bd1525) 65.27% compared to head (8babdda) 65.25%.

Files	Patch %	Lines
...c/scripts/validation/validation-results.issues.jsx	26.08%	17 Missing ⚠️
...pts/validation/validation-results.issues.issue.jsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2996      +/-   ##
==========================================
- Coverage   65.27%   65.25%   -0.03%     
==========================================
  Files         382      382              
  Lines       24594    24599       +5     
  Branches      883      883              
==========================================
- Hits        16053    16051       -2     
- Misses       8541     8548       +7     

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