anchorMC: Integrate aligned geometry download into O2DPG workflow

[sawenzel]

So far, we are creating geometry files as step of the anchorMC script. However, it is better to do this as part of the actual MC workflow in order to benefit from the features of the workflow runner (checkpointing, etc).

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[github-actions]

REQUEST FOR PRODUCTION RELEASES:
To request your PR to be included in production software, please add the corresponding labels called "async-" to your PR. Add the labels directly (if you have the permissions) or add a comment of the form (note that labels are separated by a ",")

+async-label <label1>, <label2>, !<label3> ...

This will add <label1> and <label2> and removes <label3>.

The following labels are available
async-2023-pbpb-apass4
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