test: make snapshot path matching CWD-agnostic

[drtootsie]

Fixes: #61303

Summary

The snapshot path transformation was incorrectly matching partial paths like /node within /node_modules or nodejs.org, causing false replacements.

Changes

Added negative lookahead (?![\\w/]) to the regex patterns in test/common/assertSnapshot.js to ensure only complete path segments are matched.

This prevents partial matches in:

• Directory names (e.g., /node_modules)
• URLs (e.g., nodejs.org)
• Other paths containing the CWD as a substring

Testing

Requires building Node.js and running the test suite:

./configure && make -j4
make test-only

[nodejs-github-bot]

Review requested:

• @nodejs/test_runner

[MoLow]

related?

[aduh95]

No that's from #61845

[mcollina]

lgtm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.65%. Comparing base (3dff7ef) to head (e291c5c).
⚠️ Report is 1321 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #61846 +/- ##
==========================================
- Coverage 91.63% 89.65% -1.99% 
==========================================
Files 337 676 +339 Lines 140596 206546 +65950 Branches 21789 39551 +17762 ==========================================
+ Hits 128835 185173 +56338 - Misses 11535 13480 +1945 - Partials 226 7893 +7667 

see 459 files with indirect coverage changes

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[cjihrig]

Can you separate out the unrelated changes please.

[github-actions]

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