chore(copybara): sync commits from Aspect-internal silo

[alexeagle]

Commit range https://github.com/aspect-build/silo/compare/88d14c9d79fe9fbd94893454a84ee527c53ebbae..7458fd02f4dbaa0d24160c0de1f370710fedb090

Keeping silo gazelle-clean introduced this missing bzl_library from previous sync.