fix: implement TryIntoJs and TryFromJs for common Rust wrapper types

[jakharmonika364]

Closes #4360

This PR implements TryIntoJs and TryFromJs for common Rust wrapper types and refactors class conversions to resolve trait conflicts.

Key Changes:

• Wrapper Support: Added TryIntoJs and TryFromJs support for Box, Rc, Arc, and &T.
• Architectural Refactor: Removed the blanket TryIntoJs implementation for Class + Clone and moved it into the boa_class macro. This resolves a trait conflict that was previously blocking the new wrapper implementations.
• Testing: Added a unit test manual_repro_4360 in try_into_js.rs to verify derived objects handle standard string coercion correctly.

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	52,963	52,963	0
Passed	50,073	50,073	0
Ignored	2,072	2,072	0
Failed	818	818	0
Panics	0	0	0
Conformance	94.54%	94.54%	0.00%

Tested main commit: daf86d30277a5c1fb353825347f75c1d83516905
Tested PR commit: 4721a96d8d2c1fece6add7cf0cc64211a6d64ce5
Compare commits: daf86d3...4721a96

[hansl]

Just want to clarify, this PR does not change the TryIntoJs macro, what am I missing?

[jakharmonika364]

I noticed after pushing that the prototype fix in the macro was already there in main. The main point of this PR now is implementing TryIntoJs and TryFromJs from wrapper types. I had to refactor how native classes handle conversion to resolve a trait conflict that was previously blocking those wrapper implementations. I'll update the PR description to reflect the actual changes.

[codecov]

Codecov Report

❌ Patch coverage is 12.50000% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.37%. Comparing base (6ddc2b4) to head (4721a96).
⚠️ Report is 884 commits behind head on main.

Files with missing lines	Patch %	Lines
core/engine/src/value/conversions/try_into_js.rs	0.00%	8 Missing ⚠️
core/engine/src/value/conversions/try_from_js.rs	0.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4727       +/-   ##
===========================================
+ Coverage   47.24%   59.37%   +12.13%     
===========================================
  Files         476      580      +104     
  Lines       46892    63161    +16269     
===========================================
+ Hits        22154    37504    +15350     
- Misses      24738    25657      +919     

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[jedel1043]

Needs a cargo clippy fix

[jakharmonika364]

Needs a cargo clippy fix

Fixed the cargo clippy warning by replacing str::replace with cow_utils::CowUtils::cow_replace to avoid unnecessary heap allocation when the specifier doesn't contain /.