*** DO NOT MERGE *** Untangle testpachd control flow

[robert-uhl]

This is a testbed.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 138 lines in your changes are missing coverage. Please review.

Project coverage is 58.02%. Comparing base (d01cc69) to head (0fc35f0).
Report is 2 commits behind head on master.

Files	Patch %	Lines
src/internal/pachd/testpachd.go	0.00%	95 Missing ⚠️
src/internal/dockertestenv/postgres.go	0.00%	43 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9915      +/-   ##
==========================================
- Coverage   58.08%   58.02%   -0.07%     
==========================================
  Files         608      607       -1     
  Lines       73918    73910       -8     
==========================================
- Hits        42934    42884      -50     
- Misses      30441    30471      +30     
- Partials      543      555      +12     

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