Improve e2e stability

[dyladan]

Fixes the following issues with e2e tests:

1. collector continues running if tests stop
2. tests fail if collector is already running
3. verification happens before collector finishes writing output to disk
4. local collector container may not actually be latest

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.03%. Comparing base (22bc5ba) to head (2877df5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5715   +/-   ##
=======================================
  Coverage   95.03%   95.03%           
=======================================
  Files         310      310           
  Lines        7998     7998           
  Branches     1615     1615           
=======================================
  Hits         7601     7601           
  Misses        397      397           

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