test: Migrated test/unit/spans to use node:test

[bizob2828]

Description

Migrated test/unit/spans tests to node:test.

Related Issues

Closes #2550

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.19%. Comparing base (252f3b2) to head (b16613d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2556   +/-   ##
=======================================
  Coverage   97.19%   97.19%           
=======================================
  Files         289      289           
  Lines       45448    45448           
=======================================
  Hits        44172    44172           
  Misses       1276     1276           

Flag	Coverage Δ
integration-tests-cjs-18.x	73.82% <ø> (ø)
integration-tests-cjs-20.x	73.83% <ø> (ø)
integration-tests-cjs-22.x	73.86% <ø> (ø)
integration-tests-esm-18.x	49.18% <ø> (ø)
integration-tests-esm-20.x	49.19% <ø> (ø)
integration-tests-esm-22.x	49.21% <ø> (ø)
unit-tests-18.x	88.76% <ø> (ø)
unit-tests-20.x	88.76% <ø> (ø)
unit-tests-22.x	88.77% <ø> (ø)
versioned-tests-18.x	78.85% <ø> (-0.14%)	⬇️
versioned-tests-20.x	78.89% <ø> (-0.10%)	⬇️
versioned-tests-22.x	78.89% <ø> (-0.11%)	⬇️

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