fix(runtime-limits): charge built-in iteration loops against loop budget

[linisha15]

Description

Summary
This PR ensures built-in iteration performed in Rust respects the runtime loop budget configured via set_loop_iteration_limit.

What changed

• Added loop-budget charging in built-in iteration paths using IncrementLoopIteration::operation((), context).
• Covered String.prototype.repeat and shared Array/TypedArray iteration helper paths.
• Added runtime-limit parity tests to ensure behavior matches VM loop limits.
• Added regression coverage for large repeat counts to prevent unbounded work.

Why
Previously, loop limits applied to VM-compiled loops but not all built-in Rust loops, which could bypass runtime protection.

Validation
-Verified runtime-limit tests for:

• VM loop limit behavior
• Built-in parity behavior
• Large repeat regression behavior

Closes #5060

[linisha15]

Hi! @jedel1043 , please review my pr .

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	52,963	52,963	0
Passed	49,935	49,935	0
Ignored	2,207	2,207	0
Failed	821	821	0
Panics	0	0	0
Conformance	94.28%	94.28%	0.00%

Tested main commit: 1dacd48b3356a377ba9d594d9a9ce898b519f7a6
Tested PR commit: c82d6ae9dfcc53f21472ad641f19bb5ecbca42bc
Compare commits: 1dacd48...c82d6ae

[codecov]

Codecov Report

❌ Patch coverage is 42.85714% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.13%. Comparing base (6ddc2b4) to head (e236b5a).
⚠️ Report is 852 commits behind head on main.

Files with missing lines	Patch %	Lines
core/engine/src/builtins/typed_array/builtin.rs	25.00%	12 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5070       +/-   ##
===========================================
+ Coverage   47.24%   59.13%   +11.88%     
===========================================
  Files         476      563       +87     
  Lines       46892    62589    +15697     
===========================================
+ Hits        22154    37011    +14857     
- Misses      24738    25578      +840     

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[linisha15]

Since the issue has already been resolved in another PR, I'll close this one. Thanks!