Find a Different Way to Get the Git URL of a Package Without Concretizing

[CodeGat]

See the step in https://github.com/ACCESS-NRI/ACCESS-ESM1.5/actions/runs/11396654421/job/31710870230#step:9:13 - overall this section takes 14 minutes to concretize the packages in vars.BUILD_DB_PACKAGES, which is almost as long as it took to build the package itself.

Determine if this change should be reverted or if there is a better one.