Raw data updates

[weaverba137]

This PR primarily updates the data model for the raw data files, desi-EXPID.rst. Remaining items before merging:

• High-level description of the SPEC HDU.
• Clean up other raw data model files as much as possible.
• Verify against raw data files that are already in the public area for release.

The desi-EXPID.rst file can probably be reviewed as-is, and other files primarily have structural changes.

The changes to the code allow the data model verification script to select multiple candidate files for comparison, rather than just the first one it finds.

A few new data model files have been added to reduce the number of extraneous files detected in the raw data.

[coveralls]

Coverage: 100.0%. Remained the same when pulling 4299264 on raw-data-updates into 5dd8546 on main.

[weaverba137]

@sbailey, I think you could start by reviewing desi-EXPID.rst now while I work on other parts of this.

[weaverba137]

@sbailey, I'd like to merge this soon. I think I've got about as much information into the raw data model files as we're going to get.

[sbailey]

Sounds good. Merge when ready. I haven't reviewed every file in detail, but this is definitely a step forwards compared to current main, so let's merge and make any additional updates in future PRs if needed. Thanks.