We now have 3 versions: the tarball version (version.bzl), the skylib
module version (MODULE.bazel), and the gazelle plugin module version
(gazelle/MODULE.bazel)

…ilegroup for all tarballs

Needed to allow building/testing gazelle plugin from bazelci and
generating release tarballs when in bzlmod mode.

Note that the local_path_override will be stripped out in the
tarball release, so users of stable skylib releases will not be
affected.

Users of a live/unreleased version of skylib who depend on it via
git_override will need to add a patch to remove or comment out
the local_path_override. I expect the number of such users to be
tiny, but I have added a comment in MODULE.bazel to guide them.

Needed to cleanly strip ./external/bazel_skylib_gazelle_plugin~* dir
prefixes in the tarball.

Also allows us to clean up fixed target name vs. versioned tarball
file name without needing aliases.

Note that we are using 0.7.0 since 0.8.0 is not yet in BCR.

Provide a patch file that users can use in their git_override