Remove unused variables causing compilation warnings #102

Job	Run time
cmake-integration-tests (off, ubuntu-latest)	9s
cmake-integration-tests (walltime, codspeed-macro)	26s
bazel-integration-tests (off, ubuntu-latest)	21s
tests	22s
cmake-integration-tests (instrumentation, ubuntu-latest)	6s
bazel-integration-tests (instrumentation, ubuntu-latest)	30s
bazel-integration-tests (walltime, codspeed-macro)	40s
	2m 34s

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