fix(fetch): set correct type for Response.redirect()

[HiteshShonak]

This Pull Request fixes/closes #5211.

It changes the following:

• Change ResponseType::Basic to ResponseType::Default in Response.redirect() - a new response type is "default" unless stated otherwise per the Fetch Standard.
• Add a regression test asserting Response.redirect().type === "default".

Testing:

cargo test -p boa_runtime response -- --nocapture

Spec reference: https://fetch.spec.whatwg.org/#dom-response-redirect

[Copilot]

Pull request overview

This PR aligns Boa’s Response.redirect() behavior with the Fetch Standard by ensuring newly created redirect responses have type === "default" (not "basic"), and adds a regression test to prevent reintroducing the bug reported in #5211.

Changes:

• Update Response.redirect() to construct responses with ResponseType::Default.
• Add a regression test asserting Response.redirect(...).type is "default" (with and without an explicit redirect status).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
core/runtime/src/fetch/response.rs	Fixes Response.redirect() to set the response type to Default per spec.
core/runtime/src/fetch/tests/response.rs	Adds a regression test to assert the redirect response type is "default".

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[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	52,963	52,963	0
Passed	50,539	50,539	0
Ignored	1,426	1,426	0
Failed	998	998	0
Panics	2	2	0
Conformance	95.42%	95.42%	0.00%

Tested main commit: 58a24587890677d94618259dfaa5f257ab5ef9c9
Tested PR commit: 0cff1463b1ed6f50b4f0d19af17b2d5dbfd0b676
Compare commits: 58a2458...0cff146

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.81%. Comparing base (6ddc2b4) to head (0cff146).
⚠️ Report is 913 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5212       +/-   ##
===========================================
+ Coverage   47.24%   59.81%   +12.56%     
===========================================
  Files         476      582      +106     
  Lines       46892    63460    +16568     
===========================================
+ Hits        22154    37956    +15802     
- Misses      24738    25504      +766     

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