chore(test/libsinsp_e2e): use unique ptr e2e tests inspector #725

Job	Run time
paths-filter	5s
test-scap-amd64 😆 (bundled_deps)	2m 57s
test-scap-arm64 😆 (bundled_deps)	6m 14s
build-drivers-s390x 😁 (system_deps)	48m 23s
build-modern-bpf-skeleton	2m 17s
build-drivers-ppc64le 😁 (system_deps)	53m 47s
test-drivers-amd64 😇 (bundled_deps)	9m 17s
test-drivers-arm64 😇 (bundled_deps)	11m 12s
build-scap-open-w-extern-bpf-skeleton	13m 32s
	2h 27m 44s

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