errors: handle V8 warnings in DisallowJavascriptExecutionScope

[Anshikakalpana]

Fixes: #63473

Fix crash when V8 emits warning inside DisallowJavascriptExecutionScope.

When asm.js code is evaluated in the REPL with previews enabled, V8 emits a deprecation warning inside DisallowJavascriptExecutionScope. Node's warning handler tried to call process.emit() which is JS, causing a fatal crash.

Fix:
check can_call_into_js() before calling ProcessEmitWarningGeneric. If JS is not safe, print the warning directly to stderr instead.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.09%. Comparing base (7eab492) to head (ec60a09).
⚠️ Report is 189 commits behind head on main.

Files with missing lines	Patch %	Lines
src/node_errors.cc	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #63486      +/-   ##
==========================================
+ Coverage   89.67%   90.09%   +0.41%     
==========================================
  Files         712      716       +4     
  Lines      221256   226652    +5396     
  Branches    42394    42598     +204     
==========================================
+ Hits       198420   204196    +5776     
+ Misses      14684    14314     -370     
+ Partials     8152     8142      -10     

Files with missing lines	Coverage Δ
src/node_errors.cc	63.68% <0.00%> (-0.22%)	⬇️

... and 228 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.