Proposed new feature or change:

It's a bad developer experience that spin test does not actually run all the tests by default. I don't see a particularly good reason to do this, given that the full test suite doesn't actually take that long to run. On my machine, spin test runs in 1 minute and spin test -m full runs 2 minutes. Whatever minutes of developer time are saved here are wasted in triplicate by people submitting pull requests thinking that all the tests pass when they actually don't.

I propose making spin test run the full tests by default, and adding spin test --fast to do a faster run.

I had mentioned this previously at #25914