refactor(userspace/libsinsp): cleanup chisel metrics #4869

Job	Run time
build-shared-libs-linux-amd64 🧐	3m 40s
build-libs-linux-amd64 😁 (system_deps)	5m 10s
build-libs-linux-amd64-asan 🧐	8m 25s
build-libs-linux-amd64 😁 (bundled_deps)	16m 46s
build-libs-linux-amd64 😁 (system_deps_w_chisels)	5m 31s
build-libs-linux-amd64-static 🎃	21m 54s
build-libs-linux-amd64 😁 (system_deps_minimal)	3m 46s
build-libs-others-amd64 😨 (windows-latest)	8m 41s
build-libs-linux-arm64 😁 (system_deps)	5m 20s
build-libs-others-amd64 😨 (macos-latest)	7m 37s
build-shared-libs-macos-amd64 😨	5m 8s
build-libs-linux-arm64 😁 (bundled_deps)	16m 31s
build-libs-linux-arm64 😁 (system_deps_w_chisels)	5m 32s
run-e2e-tests-amd64 (system_deps)	8m 31s
test-libs-static (bundled_deps)	14m 51s
build-libs-linux-arm64 😁 (system_deps_minimal)	3m 49s
run-e2e-tests-amd64 (bundled_deps)	20m 46s
run-e2e-tests-amd64 (system_deps_w_chisels)	8m 36s
run-e2e-tests-amd64 (asan)	21m 13s
build-libs-emscripten 🧐	3m 45s
	3h 15m 32s

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