build tests for move_data_from_api_to_database and bulk_dl

[andrewjtdunn]

edge cases to cover:

• [ ] no federal register page or text for a document. EG page exists: https://www.federalregister.gov/documents/2024/02/26/2024-03783/draft-infection-control-in-healthcare-personnel-epidemiology-and-control-of-selected-infections, but page that should have the xml text does not: https://www.federalregister.gov/api/v1/documents/CDC-2024-0014.json?fields[]=full_text_xml_url%22
• [ ] documents open for commenting on regulations.gov which don’t have a docket (eg FRS-2024-0019-0001)
• [ ] comments can be modified after they are posted -- how do we want to handle that? (dockets and documents can also be modified -- they have a modified date -- but as discussed, that’s a smaller issue). Maybe this is something we handle differently in a daily update?

[andrewjtdunn]

Also, update the existing tests to use mocking

[andrewjtdunn]

Add a test to check that the number of comments in the db matches the number of comments on regulations.gov