Add unit test for NSS users/groups #6074

Job	Run time
build-shared-libs-linux-amd64 🧐	4m 56s
build-libs-linux-amd64-static 🎃	22m 32s
build-libs-emscripten 🧐	4m 25s
build-libs-others-amd64 😨 (windows-latest, MultiThreaded)	6m 19s
build-libs-linux-amd64 😁 (system_deps)	6m 4s
build-libs-others-amd64 😨 (windows-latest, MultiThreadedDLL)	6m 4s
build-libs-linux-amd64 😁 (bundled_deps)	17m 30s
build-shared-libs-macos-amd64 😨	3m 46s
build-libs-others-amd64 😨 (macos-latest)	3m 57s
build-libs-linux-amd64 😁 (system_deps_minimal)	4m 35s
build-libs-linux-amd64 😁 (sanitizers)	14m 53s
run-e2e-tests-amd64 (system_deps)	8m 58s
build-libs-linux-arm64 😁 (system_deps)	8m 18s
test-libs-static (bundled_deps)	15m 5s
run-e2e-tests-amd64 (bundled_deps)	20m 1s
build-libs-linux-arm64 😁 (bundled_deps)	21m 23s
run-e2e-tests-amd64 (asan)	21m 28s
build-libs-linux-arm64 😁 (system_deps_minimal)	6m 33s
build-libs-linux-arm64 😁 (sanitizers)	18m 42s
	3h 35m 29s

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