Implement toolchain harvesting for cpp #457

Job	Run time
tests	8s
cmake-integration-tests (off, ubuntu-latest)	10s
bazel-integration-tests (walltime, codspeed-macro)	8m 21s
bazel-integration-tests (simulation, ubuntu-latest)	1m 20s
cmake-integration-tests (simulation, ubuntu-latest)	20s
bazel-integration-tests (off, ubuntu-latest)	36s
cmake-integration-tests (walltime, codspeed-macro)	1s
cmake-build (ubuntu-latest, walltime)	13s
bazel-integration-tests (memory, ubuntu-latest)	53s
cmake-integration-tests (memory, ubuntu-latest)	13s
lint	14s
cmake-build (windows-latest, walltime)	44s
bazel-build (ubuntu-latest, off, 7.6.2)	29s
bazel-build (ubuntu-latest, off, 9.0.0-pre.20250921.2)	1m 13s
cmake-build (ubuntu-latest, off)	8s
bazel-build (ubuntu-latest, walltime, 7.6.2)	38s
bazel-build (windows-latest, off, 7.6.2)	1m 33s
bazel-build (windows-latest, off, 8.4.2)	2m 24s
bazel-build (windows-latest, walltime, 9.0.0-pre.20250921.2)	2m 25s
cmake-build (windows-latest, off)	54s
bazel-build (ubuntu-latest, off, 8.4.2)	35s
bazel-build (windows-latest, walltime, 8.4.2)	1m 40s
bazel-build (ubuntu-latest, walltime, 8.4.2)	39s
bazel-build (windows-latest, off, 9.0.0-pre.20250921.2)	1m 40s
bazel-build (ubuntu-latest, walltime, 9.0.0-pre.20250921.2)	1m 21s
bazel-build (windows-latest, walltime, 7.6.2)	1m 37s
	30m 29s

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