permission: support v8.setHeapSnapshotNearHeapLimit

[IlyasShabi]

This adds a file permission check before registering the near-heap-limit callback when using v8.setHeapSnapshotNearHeapLimit() to avoid writing a heap snapshot without permission.

[nodejs-github-bot]

Review requested:

• @nodejs/security-wg

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.16%. Comparing base (b2a024b) to head (492a8b6).
⚠️ Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
src/node_v8.cc	60.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #64808   +/-   ##
=======================================
  Coverage   90.15%   90.16%           
=======================================
  Files         744      744           
  Lines      242542   242547    +5     
  Branches    45690    45694    +4     
=======================================
+ Hits       218672   218681    +9     
  Misses      15362    15362           
+ Partials     8508     8504    -4     

Files with missing lines	Coverage Δ
src/node_v8.cc	87.86% <60.00%> (-0.45%)	⬇️

... and 29 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/75264/

[nodejs-github-bot]

V8 CI: https://ci.nodejs.org/job/node-test-commit-v8-linux/nodes=benchmark-ubuntu2404-intel-64,v8test=v8test/7290/

[nodejs-github-bot]

V8 CI: https://ci.nodejs.org/job/node-test-commit-v8-linux/nodes=rhel8-power9le,v8test=v8test/7290/

[nodejs-github-bot]

V8 CI: https://ci.nodejs.org/job/node-test-commit-v8-linux/nodes=rhel8-s390x,v8test=v8test/7290/