src: handle indexed properties in process.env

[targos]

Closes: #60795

I'm not sure if we should treat this as a breaking change.
Before this change, indexed properties would not be intercepted, so setting them in JS would not coerce the value to a string.

[codecov]

Codecov Report

❌ Patch coverage is 70.37037% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.56%. Comparing base (430db0d) to head (ef1b42c).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
src/node_env_var.cc	70.37%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #60826      +/-   ##
==========================================
+ Coverage   88.55%   88.56%   +0.01%     
==========================================
  Files         703      703              
  Lines      208237   208264      +27     
  Branches    40157    40162       +5     
==========================================
+ Hits       184395   184448      +53     
+ Misses      15858    15827      -31     
- Partials     7984     7989       +5     

Files with missing lines	Coverage Δ
src/node_env_var.cc	82.21% <70.37%> (-0.93%)	⬇️

... and 32 files with indirect coverage changes

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[Renegade334]

Are there consequences from having the named property enumerator emit numeric values? (I know that's what happens currently...)

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70294/

[targos]

Rebased to include #60846 and fixed a typo in the commit message.

[targos]

Are there consequences from having the named property enumerator emit numeric values? (I know that's what happens currently...)

@Renegade334 I think it only affects users of the C++ API, which allows to skip indices.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70328/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70330/

[nodejs-github-bot]

Landed in 08d966c