testrunner: do not load std.cfg in executor tests

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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[firewave]

A better solution would be to make it a shared pointer but that would be way more intrusive.

This greatly speeds up the FileSettings executor tests since that analysis needs to copy the settings which includes the library.

TestThreadExecutorFS::many_threads
Clang 22 689,859,031 -> 76,287,375

valgrund runtime

before
5,37s user 0,14s system 99% cpu 5,546 total

after
1,69s user 0,11s system 99% cpu 1,822 total