tests: add support for Catch2 v3 #78
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Catch2 v3 no longer has a monolithic <catch.hpp> and also requires linking against compiled libraries:
https://github.com/catchorg/Catch2/blob/v3.0.1/docs/migrate-v2-to-v3.md
This allows either v2 or v3 of system-installed Catch2 to be used.
Related: USBGuard/usbguard#659