fix(libsinsp): avoid double dumping containers and users #4832

Job	Run time
build-libs-linux-amd64-static 🎃	22m 1s
build-libs-linux-amd64-asan 🧐	8m 12s
build-libs-linux-amd64 😁 (system_deps)	5m 9s
build-libs-others-amd64 😨 (windows-latest)	9m 35s
build-libs-linux-amd64 😁 (bundled_deps)	16m 54s
build-shared-libs-linux-amd64 🧐	3m 43s
build-libs-others-amd64 😨 (macos-latest)	13m 9s
build-libs-linux-amd64 😁 (system_deps_w_chisels)	5m 14s
build-libs-linux-amd64 😁 (system_deps_minimal)	3m 39s
build-shared-libs-macos-amd64 😨	3m 16s
build-libs-linux-arm64 😁 (system_deps)	5m 17s
build-libs-linux-arm64 😁 (bundled_deps)	17m 7s
build-libs-linux-arm64 😁 (system_deps_w_chisels)	5m 20s
build-libs-linux-arm64 😁 (system_deps_minimal)	3m 43s
build-libs-emscripten 🧐	3m 52s
test-libs-static (bundled_deps)	15m 58s
run-e2e-tests-amd64 (system_deps)	8m 24s
run-e2e-tests-amd64 (bundled_deps)	19m 44s
run-e2e-tests-amd64 (system_deps_w_chisels)	8m 26s
run-e2e-tests-amd64 (asan)	22m 13s
	3h 20m 56s

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