feat(libsinsp_e2e): add unix_udp_client_server_read test #2169

Job	Run time
build-test-e2e-amd64 😇 (bundled_deps)	13m 29s
build-test-e2e-arm64 😇 (bundled_deps)	28m 10s
test-e2e-amd64-kmod 😇 (bundled_deps)	9m 25s
test-e2e-amd64-bpf 😇 (bundled_deps)	11m 5s
test-e2e-amd64-modern-bpf 😇 (bundled_deps)	10m 52s
test-e2e-arm64-kmod 😇 (bundled_deps)	19m 42s
test-e2e-arm64-bpf 😇 (bundled_deps)	17m 34s
test-e2e-arm64-modern-bpf 😇 (bundled_deps)	6h 0m 13s
	7h 50m 30s

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