Speed up activate tests

[mkenigs]

Timebox to speed up our activate tests and/or get a better understanding of why they're hard to speed up

Some ideas:

• Drop tests if they aren't providing value
• Combine tests if they're testing similar things
• Don't wait so long for the watchdog. Set a lower polling time or signal it to exit? Per https://github.com/flox/flox/issues/2395#issuecomment-2533445004 we may be waiting 100ms