[CMake] Run a single test without parallelism

[Dzenan Zukic]

Hi everybody,

is there a way to prevent a test being run concurrently? I have a few tests
which consume gigabytes of RAM, and when tests are being run in parallel
(e.g. -j5) some of them non-deterministically fail due to memory allocation
errors. Running most of the tests in parallel is an imperative because
there are thousands of them.

Regards,
Dženan
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