Fix local command-line testruns on Windows

[bkoelman]

Throttle tests extra when running from the command line on Windows (both in CI and locally).
This fixes errors when running ./Build.ps1 locally on Windows with Docker.

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.
✅ Project coverage is 92.06%. Comparing base (43550ca) to head (e8610cb).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1765   +/-   ##
=======================================
  Coverage   92.06%   92.06%           
=======================================
  Files         475      475           
  Lines       14699    14699           
  Branches     2322     2322           
=======================================
  Hits        13533    13533           
  Misses        765      765           
  Partials      401      401           

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