chore(libsinsp/test): use GTEST_SKIP to track disabled tests #2145

Job	Run time
build-test-e2e-amd64 😇 (bundled_deps)	15m 14s
build-test-e2e-arm64 😇 (bundled_deps)	29m 50s
test-e2e-amd64-kmod 😇 (bundled_deps)	9m 9s
test-e2e-amd64-bpf 😇 (bundled_deps)	11m 46s
test-e2e-amd64-modern-bpf 😇 (bundled_deps)	11m 10s
test-e2e-arm64-kmod 😇 (bundled_deps)	16m 38s
test-e2e-arm64-bpf 😇 (bundled_deps)	6h 0m 12s
test-e2e-arm64-modern-bpf 😇 (bundled_deps)	6h 0m 14s
	13h 34m 13s

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