fix: Mirror setTimeout endowment in setInterval

[FrederikBolding]

Mirror setTimeout endowment in setInterval.

---

Note

Low Risk
Small parity fix in the Snap timer endowment that matches an existing setTimeout pattern; no new APIs or auth/data paths.

Overview
The attenuated setInterval endowment no longer registers the Snap’s callback directly with the platform timer. It now uses the same wrapper as setTimeout: a small arrow function that forwards ...passedArgs into the hardened handler.

This keeps interval ticks consistent with timeout callbacks in the execution environment (invocation path and hardened-function behavior) without changing validation, handle registration, or clearInterval semantics.

^{Reviewed by Cursor Bugbot for commit ab2b91a. Bugbot is set up for automated code reviews on this repo. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.60%. Comparing base (9127573) to head (ab2b91a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4127   +/-   ##
=======================================
  Coverage   98.60%   98.60%           
=======================================
  Files         429      429           
  Lines       12509    12511    +2     
  Branches     1978     1978           
=======================================
+ Hits        12334    12336    +2     
  Misses        175      175           

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