Allow redirects to trusted domains

[dmitrivMS]

Fixes #278618 (no redirects in the chat)
Fixes #280714 (partial in that we will silently redirect for trusted domains, nytimes is not part of that)

[Copilot]

Pull request overview

This pull request adds functionality to allow redirects to trusted domains in the web content extractor service. The changes enable the WebPageLoader to accept a callback for checking trusted domains and to automatically allow redirects between www and non-www versions of the same domain.

Key Changes:

• Modified redirect logic to normalize domain authorities (removing "www." prefix for comparison)
• Added a trusted domain callback parameter to WebPageLoader constructor
• Removed the equalsIgnoreCase import as it's no longer needed with the new normalization approach
• Added comprehensive test coverage for www/non-www redirects and trusted domain validation

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/vs/platform/webContentExtractor/electron-main/webPageLoader.ts	Refactored redirect logic to add www-prefix normalization and trusted domain checking via callback
src/vs/platform/webContentExtractor/test/electron-main/webPageLoader.test.ts	Added 5 new test cases covering www redirects, trusted domains, non-trusted domains, and wildcard subdomain matching
src/vs/platform/webContentExtractor/electron-main/webContentExtractorService.ts	CRITICAL ISSUES: Contains commented-out import and attempts to inject ITrustedDomainService which causes compilation errors and violates layering architecture

Critical Issues Identified:
The webContentExtractorService.ts file has compilation errors due to a commented-out import and attempts to use ITrustedDomainService from the workbench layer in the platform layer, which violates VS Code's strict layering architecture where platform cannot depend on workbench.