component/golang: skip testAmbientCaps tests if there is no nobody user
When there is not a nobody user (for example inside Docker), the tests TestAmbientCaps and TestAmbientCapsUserns should be skipped instead of failing.
This has been patched upstream in https://github.com/golang/go/commit/1959703dddffef61760d5d4fdedc4df8d2d73438 and we use here that patch.