Route GHE.com remotes through enterprise authentication

[Copilot]

GHE.com remotes could be classified as Enterprise but still use the GitHub.com authentication provider, causing repository queries to fail and the PR panel to appear empty.

Changes

• Derive GitHubRemote.authProviderId from its detected server type:

  Enterprise   → github-enterprise
  GitHubDotCom → github
  None         → existing URI-based fallback

• Log each remote’s server classification and selected authentication provider.
• Add regression coverage for Enterprise and GitHub.com remotes.

• Fixes GHE.com data residency: repo-scoped queries bound to github.com provider — PR panel shows 0 in all categories (clean-profile repro included) #8868

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[Copilot]

Pull request overview

This PR fixes authentication misbinding for *.ghe.com (and other Enterprise-classified) remotes by routing them through the Enterprise authentication provider based on server-type classification rather than a strict URI-authority match, preventing repo-scoped queries from failing and the PR view from appearing empty.

Changes:

• Derives GitHubRemote.authProviderId from GitHubServerType (Enterprise → github-enterprise, GitHub.com → github, otherwise fallback to existing URI-based behavior).
• Adds debug logging to record each remote’s server classification and chosen auth provider.
• Adds regression tests covering Enterprise vs GitHub.com auth-provider selection.

Show a summary per file

File	Description
src/common/remote.ts	Overrides GitHubRemote.authProviderId based on server classification and logs the chosen auth provider per remote.
src/test/common/remote.test.ts	Adds regression tests asserting auth-provider selection for Enterprise and GitHub.com remotes.

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• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite