test: rfc: refactor: run_float_fn -> run_float_fn_approx

[acl-cqc]

Uses pytest.approx, see https://docs.pytest.org/en/stable/reference/reference.html#pytest-approx, with optional configurable rel and abs.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.67%. Comparing base (992b138) to head (fecff61).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #507   +/-   ##
=======================================
  Coverage   91.67%   91.67%           
=======================================
  Files          59       59           
  Lines        6138     6138           
=======================================
  Hits         5627     5627           
  Misses        511      511           

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