Create separate staging and production profiles

[jashapiro]

To better ensure that the results from scpca-nf are stable and allow easier comparisons between the production results and any changes in progress, we should create separate staging and production profiles, with separate output locations for checkpoints and results.

The current ccdl profile uses an output location that is effectively a testing ground; there are no particular controls on the data that are found there. When we are performing a production run, we currently set the output location to the scpca-prod directory manually with the --outdir parameter, but this is a bit brittle and, well, manual.

Instead, we should define ccdl_staging and ccdl_prod profiles that set appropriate output paths.

For extra protection, we may want to see if we can restrict the production profile so that will only run with a versioned tag (so we do not accidentally overwrite results from a development version of the workflow).

This issue should also include:

• Creation of an appropriate staging output location (scpca-staging), which will begin as a duplicate of the scpca-prod directory
• Changes to documentation to reflect usage of the new profiles, including at https://github.com/AlexsLemonade/ScPCA-admin/tree/main/data-processing-and-handoff