fix(down): Enable bringing down starting services

[IanWoodard]

Currently, you can only bring down services that have been completely brought up. This is not ideal as it makes it difficult to bring down services that are partially up, forcing users to use the purge command. This change improves down so that you can bring down services once they start being brought up even if they are not fully up.
https://getsentry.atlassian.net/browse/DEVINFRA-455

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.78%. Comparing base (34f05b2) to head (e2c9987).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #211      +/-   ##
==========================================
+ Coverage   92.74%   92.78%   +0.04%     
==========================================
  Files          22       22              
  Lines        1557     1567      +10     
==========================================
+ Hits         1444     1454      +10     
  Misses        113      113              

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