Speedup utils tests

[shrik450]

Takes tests/test_utils.py from 5 minutes to 5 seconds, and resolves one of the biggest pain points of writing and updating utils tests.

Replaces #127, and part of #29.

This involves two major changes:

• Use pytest-recording (and indirectly vcr.py) to save network requests made by the tests, which leads to a massive speedup in the run time of the utils tests.
• Use syrupy to store test data as snapshots instead of manually saving them. This eliminates the manual effort required to manage our test files, making it much more convenient to update existing tests and create new tests.

Since we're going to be changing a lot of test data in the multi-part component combination work, this should go before to make it much faster for me to iterate on that 🙏

Known downsides:

• Since vcr matches on the name of the repo, the utils tests now create repos with well-known names, and delete those repos at the end of the test. If you interrupt a test, the cleanup might not run and you will have to manually delete those repos for tests to pass.

[McRaeAlex]

Should this be getoption("--record-mode")

[shrik450]

No, this gives us an argparse namespace that removes the leading --.

[kdumontnu]

👍 Nice for adding the cron job to re-record the casettes