src: optimize trace_name allocation in Worker::Run

[mertcanaltin]

I tried to prevent unnecessary temporary strings

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.54%. Comparing base (d09c3ff) to head (1b54dd6).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #60886      +/-   ##
==========================================
- Coverage   88.54%   88.54%   -0.01%     
==========================================
  Files         703      703              
  Lines      208291   208299       +8     
  Branches    40165    40170       +5     
==========================================
+ Hits       184437   184443       +6     
- Misses      15863    15879      +16     
+ Partials     7991     7977      -14     

Files with missing lines	Coverage Δ
src/node_worker.cc	81.84% <100.00%> (+0.33%)	⬆️

... and 38 files with indirect coverage changes

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