chore(userspace/libsinsp): keep a reference on m_sinsp_stats_v2 where needed #6072

Job	Run time
build-libs-linux-amd64-static 🎃	22m 47s
build-shared-libs-linux-amd64 🧐	4m 34s
build-libs-linux-amd64 😁 (system_deps)	6m 1s
build-libs-others-amd64 😨 (windows-latest, MultiThreaded)	6m 11s
build-libs-linux-amd64 😁 (bundled_deps)	17m 31s
build-shared-libs-macos-amd64 😨	3m 47s
build-libs-others-amd64 😨 (windows-latest, MultiThreadedDLL)	6m 8s
build-libs-linux-amd64 😁 (system_deps_minimal)	4m 29s
build-libs-others-amd64 😨 (macos-latest)	4m 16s
build-libs-linux-amd64 😁 (sanitizers)	14m 3s
run-e2e-tests-amd64 (system_deps)	8m 55s
build-libs-linux-arm64 😁 (system_deps)	6m 59s
run-e2e-tests-amd64 (bundled_deps)	20m 0s
test-libs-static (bundled_deps)	15m 0s
build-libs-linux-arm64 😁 (bundled_deps)	22m 39s
run-e2e-tests-amd64 (asan)	21m 23s
build-libs-linux-arm64 😁 (system_deps_minimal)	4m 48s
build-libs-linux-arm64 😁 (sanitizers)	22m 38s
build-libs-emscripten 🧐	4m 12s
perf-libs-linux-amd64	6m 47s
	3h 43m 8s

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