[llvm] [llvm][release] Reveal download links based on uploaded assets (PR #167688)

[David Spickett via llvm-commits]

DavidSpickett wrote:

Thanks for the review Cullen.

Do any of the other release managers want to take a look?

No rush to merge yet, the real test of it will be when the 22.x cycle starts.

> No need to re-run the script.

I should note that I think the script could be run locally after the initial release, if you had the right token permissions. I think the script is ready for that as it is, but I need to do more testing of that use case.

Regardless of that, I think this PR improves on the existing setup by at least making the popular links automatic.

https://github.com/llvm/llvm-project/pull/167688