Split reanalyse and aCLImatise new into separate jobs

[multimeric]

In Actions, separate jobs each have a 6 hour limit. We are currently hitting that limit with everything in one job, so they need to be split out. We can use composite actions to do this in a DRY way.

[multimeric]

Also, files can be passed between steps using: https://docs.github.com/en/actions/guides/storing-workflow-data-as-artifacts#passing-data-between-jobs-in-a-workflow