fix: dont optimize out benches #185

Job	Run time
tests	13s
windows-cmake-build (off)	1m 48s
cmake-integration-tests (off, ubuntu-latest)	56s
cmake-integration-tests (walltime, codspeed-macro)	2m 2s
windows-cmake-build (walltime)	1m 55s
cmake-integration-tests (instrumentation, ubuntu-latest)	2m 1s
bazel-integration-tests (walltime, codspeed-macro)	1m 19s
windows-bazel-build (off)	1m 21s
bazel-integration-tests (off, ubuntu-latest)	15s
bazel-integration-tests (instrumentation, ubuntu-latest)	1m 6s
windows-bazel-build (walltime)	49s
	13m 45s

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