fix: test framework supports ensuring specific port is open

[jaw]

The generic "waitforserver" has been renamed to
"ensureserverrunning".

This command now also takes an argument which denotes which environment variable to pick the port from.

This is needed as the ports are randomized by the test.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.67%. Comparing base (b06b555) to head (0764890).
Report is 84 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #606      +/-   ##
==========================================
- Coverage   51.96%   51.67%   -0.29%     
==========================================
  Files         157      159       +2     
  Lines       13454    13529      +75     
==========================================
  Hits         6991     6991              
- Misses       5891     5969      +78     
+ Partials      572      569       -3     

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