Switch to `rules_patchelf` from `//debian/launcher`

rules_patchelf makes the Debian launcher generic.

A 1.0.0 release is available. It still needs to be upstreamed to the BCR. Getting it integrated into rules_labgrid would provide some "real world" usage before we upstream.

The e2e tests have an example of using the API which is quite similar to the current Debian launcher. One change is that we can drop rules_tar as the filtering is included into the patchelf_unpack.

This is a follow on to #13 (closed).