fix(gc): saturate non_root_count at NON_ROOTS_MAX instead of panicking

[shruti2522]

It changes the following:

saturating at NON_ROOTS_MAX pins the counter instead of panicking. pinned counter returns true for is_rooted so the object is kept alive rather than freed, a leak is safer than a UAF anyways. The limit ~2^31 heap references to one object is unreachable in practice

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	52,963	52,963	0
Passed	49,687	49,687	0
Ignored	2,262	2,262	0
Failed	1,014	1,014	0
Panics	0	0	0
Conformance	93.81%	93.81%	0.00%

Tested main commit: b3d820369072123ded8defc927405b99b9012648
Tested PR commit: dd014547c93397224ca7489737f01968a947c70f
Compare commits: b3d8203...dd01454

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.79%. Comparing base (6ddc2b4) to head (dd01454).
⚠️ Report is 775 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4936       +/-   ##
===========================================
+ Coverage   47.24%   57.79%   +10.55%     
===========================================
  Files         476      556       +80     
  Lines       46892    60926    +14034     
===========================================
+ Hits        22154    35213    +13059     
- Misses      24738    25713      +975     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 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.

[jedel1043]

Well that would make it so that we underflow after all references get dropped. right? Then we're patching one panic with another one

[shruti2522]

Well that would make it so that we underflow after all references get dropped. right? Then we're patching one panic with another one

oh yes, missed that 😅 let me look into this more carefully