RFR: Remove Leyden experimental workflow

[Ioi Lam]

On Fri, 27 Jun 2025 19:46:55 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> > Looks good. @iklam I wonder if should move LeydenGCFlags to mainstream. It is not testing anything specific to leyden repo.
> 
> If we decide to move we should rename it to use `AOT` instead of `Leyden` to avoid confusion. I think we should replace all instances of `leyden` with `AOT`.

OK, I will rename Leyden to AOT in a follow-up changeset. I will to keep this one simple.

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PR Comment: https://git.openjdk.org/leyden/pull/83#issuecomment-3014212236