wip: chore(libsinsp): remove unused container manager method #6881

Job	Run time
build-libs-linux-amd64-static 🎃	22m 46s
build-libs-others-amd64 😨 (windows-latest, MultiThreaded)	4m 56s
build-libs-linux-amd64 😁 (system_deps)	6m 32s
build-libs-others-amd64 😨 (windows-latest, MultiThreadedDLL)	5m 11s
build-shared-libs-linux-amd64 🧐	5m 23s
build-libs-linux-amd64 😁 (bundled_deps)	16m 38s
build-libs-others-amd64 😨 (macos-latest)	2m 38s
build-shared-libs-macos-amd64 😨	1m 3s
build-libs-linux-amd64 😁 (system_deps_minimal)	5m 2s
test-libs-static (bundled_deps)	13m 45s
build-libs-linux-amd64 😁 (sanitizers)	15m 33s
build-libs-linux-amd64 😁 (zig)	26m 9s
run-e2e-tests-amd64 (system_deps)	8m 54s
build-libs-emscripten 🧐	4m 45s
run-e2e-tests-amd64 (bundled_deps)	18m 52s
build-libs-linux-arm64 😁 (system_deps)	6m 58s
run-e2e-tests-amd64 (asan)	20m 37s
build-libs-linux-arm64 😁 (bundled_deps)	17m 9s
build-libs-linux-arm64 😁 (system_deps_minimal)	5m 43s
build-libs-linux-arm64 😁 (sanitizers)	18m 27s
build-libs-linux-arm64 😁 (zig)	25m 13s
	4h 12m 14s

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