Allow Prerelease CI to fire on `dev` branches

See https://github.com/ACCESS-NRI/ACCESS-ESM1.6/pull/20#issuecomment-2537361470

We require the ability to batch changes into a `dev` branch before merging into a `main` branch for a release. Update the Prerelease CI so that it can run on PRs to `dev`. 
