Flag to set the random seed in acceptance tests

[zregvart]

Might be useful on very narrow set of cases to control the random seed used by the acceptance tests, so this adds a flag to set it.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.11%. Comparing base (1b7d62d) to head (b12ef5f).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1952   +/-   ##
=======================================
  Coverage   74.11%   74.11%           
=======================================
  Files          88       88           
  Lines        5729     5729           
=======================================
  Hits         4246     4246           
  Misses       1483     1483           

Flag	Coverage Δ
generative	74.11% <ø> (ø)
integration	74.11% <ø> (ø)
unit	74.11% <ø> (ø)

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