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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