fix: forc-test log decoding in libraries

[sdankel]

Description

Closes #6468

Checklist

• I have linked to any relevant issues.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation where relevant (API docs, the reference, and the Sway book).
  • If my change requires substantial documentation changes, I have requested support from the DevRel team
• I have added tests that prove my fix is effective or that my feature works.
• I have added (or requested a maintainer to add) the necessary Breaking* or New Feature labels where relevant.
• I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
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[codspeed-hq]

CodSpeed Performance Report

Merging #6518 will not alter performance

_{Comparing sophie/library-log-bug (55ef46a) with master (5699721)}

Summary

✅ 22 untouched benchmarks

[JoshuaBatty]

Nice one thanks. Would we be able to add the tests reported in the original issue as well so we can confirm this situation is fixed as well?

[kayagokalp]

🚀