[llvm] workflows/release-asset-audit: Split workflow into two jobs (PR #179833)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 approved this pull request.

LGTM. Given there are other workflows that need to create issues (like the commit access audit workflow), might be worth turning this into something like the `issue-write.yaml` workflow at some point, but that can be left to future cleanup.

https://github.com/llvm/llvm-project/pull/179833