Reduce tests verbosity in cibuild

[bkoelman]

This PR reduces logging output when running tests in ci-build, by setting environment variables that override log levels from appsettings.json.

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• Adapted tests
• N/A: Documentation updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ee0b942) 90.74% compared to head (8064178) 90.74%.

❗ Current head 8064178 differs from pull request most recent head 4f35ddf. Consider uploading reports for the commit 4f35ddf to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1430   +/-   ##
=======================================
  Coverage   90.74%   90.74%           
=======================================
  Files         344      344           
  Lines       11003    11003           
  Branches     1813     1813           
=======================================
  Hits         9985     9985           
  Misses        669      669           
  Partials      349      349           

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