Stop retrying inaccessible repositories after 404

[Copilot]

Repository metadata 404s left dead remotes active, allowing repeated requests to consume the shared API-call budget and block healthy repositories. Existing warnings did not identify the failing repository or workspace folder.

• Terminal failure handling

  • Cache non-SAML metadata 404s as inaccessible for the session.
  • Preserve the existing SAML reauthorization flow.

• Repository isolation

  • Remove and dispose inaccessible repositories before downstream fetches.
  • Prevent subsequent creation paths from re-adding known-dead repositories.
  • Keep healthy workspace repositories active.

• Actionable diagnostics

  • Log the repository, remote, and workspace path once:

Repository owner/repo from remote origin in workspace folder /workspace/repo returned HTTP 404 and will be skipped for this session.

• Fixes Dead/inaccessible repo in multi-folder workspace: endless 404 retries exhaust the internal 140-call limit, and the log never names the failing repo #8883

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[Copilot]

Pull request overview

This PR addresses repeated, unproductive retries against repositories that return a non-SAML HTTP 404 when fetching repository metadata, which can exhaust the extension’s shared API-call budget and degrade multi-folder workspaces. It adds session-scoped “inaccessible repo” tracking, removes inaccessible repos from active processing, and improves log diagnostics to identify the failing repository and workspace folder.

Changes:

• Cache non-SAML repository-metadata 404s as “inaccessible” for the current session and suppress further retry/log noise for those repos.
• Isolate failures by removing/disposing inaccessible repositories and preventing their recreation during subsequent update/creation flows.
• Add targeted tests covering 404 caching/logging behavior and ensuring healthy repositories are unaffected.

Show a summary per file

File	Description
src/github/githubRepository.ts	Marks repos inaccessible on non-SAML 404 during metadata fetch; suppresses repeated work/logging and returns false early from resolveRemote.
src/github/folderRepositoryManager.ts	Filters known-inaccessible repos during updates, removes/disposing inaccessible repos, and blocks recreation via createGitHubRepository.
src/test/github/githubRepository.test.ts	Adds unit tests validating one-time logging + caching of inaccessible repos and preserving SAML behavior.
src/test/github/folderRepositoryManager.test.ts	Adds coverage ensuring inaccessible repos are skipped/removed without impacting healthy repos, and that recreation is blocked.

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• Files reviewed: 4/4 changed files
• Comments generated: 1
• Review effort level: Lite