test: avoid overmatching project root in snapshots

[YsRza]

Summary

Update snapshot path normalization to avoid replacing project-root path text inside unrelated strings.

When the Node.js checkout lives in a short path such as /node, the current project-root transform can also match text inside values like https://nodejs.org or /node_modules. This can corrupt normalized output and make snapshot tests depend on the current working directory.

Changes

• Adds a path-boundary check when creating the project-root replacement regex.
• Keeps replacements for real paths such as /node/test/file.js.
• Avoids replacing /node inside https://nodejs.org and /node_modules.

Validation

• git diff --check
• Manual boundary check with node -e

I also tried running node test/parallel/test-node-output-v8-warning.mjs, but this local environment failed to spawn the child process with EPERM.

Refs: #61303

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.03%. Comparing base (1a02250) to head (af029ed).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #63254      +/-   ##
==========================================
+ Coverage   90.02%   90.03%   +0.01%     
==========================================
  Files         713      713              
  Lines      224950   224950              
  Branches    42536    42537       +1     
==========================================
+ Hits       202504   202528      +24     
+ Misses      14233    14190      -43     
- Partials     8213     8232      +19     

see 31 files with indirect coverage changes

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