src: replace FIXED_ONE_BYTE_STRING with Environment-cached strings

[iknoom]

This PR replaces FIXED_ONE_BYTE_STRING(isolate, "...") literals with Environment-cached strings.

[nodejs-github-bot]

Review requested:

• @nodejs/realm
• @nodejs/sqlite
• @nodejs/startup

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 88.29%. Comparing base (58f408f) to head (ad43278).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/node_sqlite.cc	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #59891   +/-   ##
=======================================
  Coverage   88.29%   88.29%           
=======================================
  Files         702      702           
  Lines      206875   206871    -4     
  Branches    39797    39803    +6     
=======================================
+ Hits       182655   182662    +7     
+ Misses      16226    16208   -18     
- Partials     7994     8001    +7     

Files with missing lines	Coverage Δ
src/node_realm.cc	75.14% <100.00%> (ø)
src/node_webstorage.cc	72.13% <100.00%> (-0.07%)	⬇️
src/stream_wrap.cc	87.55% <100.00%> (-0.06%)	⬇️
src/node_sqlite.cc	81.55% <50.00%> (-0.03%)	⬇️

... and 23 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69242/

[nodejs-github-bot]

Landed in db926dc