chore(tests): read test list from file

[SamWilsn]

🗒️ Description

Teaches the json_infra tests how to read the set of tests to execute from a file. Useful in conjunction with minimize-tests.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.06%. Comparing base (522b320) to head (ad4e653).

Additional details and impacted files

@@             Coverage Diff              @@
##           forks/osaka    #1807   +/-   ##
============================================
  Coverage        87.06%   87.06%           
============================================
  Files              541      541           
  Lines            32832    32832           
  Branches          3015     3015           
============================================
  Hits             28586    28586           
  Misses            3598     3598           
  Partials           648      648           

Flag	Coverage Δ
unittests	87.06% <ø> (ø)

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