src: remove unnecessary c_str() conversions in diagnostic messages

[addaleax]

No description provided.

[nodejs-github-bot]

Review requested:

• @nodejs/inspector
• @nodejs/security-wg
• @nodejs/single-executable
• @nodejs/sqlite
• @nodejs/startup

[codecov]

Codecov Report

❌ Patch coverage is 30.43478% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.74%. Comparing base (4a13a62) to head (0428717).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/node_snapshotable.cc	10.00%	18 Missing ⚠️
src/node_config_file.cc	53.84%	6 Missing ⚠️
src/blob_serializer_deserializer-inl.h	0.00%	5 Missing ⚠️
src/permission/fs_permission.cc	0.00%	2 Missing ⚠️
src/node_builtins.cc	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #61786      +/-   ##
==========================================
- Coverage   89.76%   89.74%   -0.02%     
==========================================
  Files         675      675              
  Lines      204674   204660      -14     
  Branches    39330    39329       -1     
==========================================
- Hits       183716   183682      -34     
- Misses      13235    13241       +6     
- Partials     7723     7737      +14     

Files with missing lines	Coverage Δ
src/compile_cache.cc	80.72% <100.00%> (-0.06%)	⬇️
src/env.cc	85.07% <100.00%> (-0.16%)	⬇️
src/inspector_profiler.cc	82.36% <ø> (-0.05%)	⬇️
src/node_errors.cc	63.86% <100.00%> (-0.05%)	⬇️
src/node_sea.cc	92.67% <100.00%> (ø)
src/node_sqlite.cc	80.90% <100.00%> (ø)
src/node_builtins.cc	75.95% <0.00%> (ø)
src/permission/fs_permission.cc	69.71% <0.00%> (+0.48%)	⬆️
src/blob_serializer_deserializer-inl.h	69.38% <0.00%> (+0.51%)	⬆️
src/node_config_file.cc	81.50% <53.84%> (-0.46%)	⬇️
... and 1 more

... and 28 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/71323/