status: always show json

[dberenbaum]

Fixes #10242. This it so that dvc status -q --json returns JSON and only JSON. Without this PR, dvc status -q --json returns only an exit code, and dvc status --json included non-critical logger output in addition to JSON, so there was no way to guarantee that stdout would return valid JSON.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (18a9fea) 90.50% compared to head (8458acb) 90.49%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10253      +/-   ##
==========================================
- Coverage   90.50%   90.49%   -0.02%     
==========================================
  Files         493      493              
  Lines       37643    37643              
  Branches     5457     5457              
==========================================
- Hits        34069    34064       -5     
- Misses       2950     2953       +3     
- Partials      624      626       +2     

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[efiop]

Thank you!