fix(auth): include configured subfolder in OAuth URL

Yarra Vivekrequested to merge
vivekyarra567/cli:fix/oauth-subfolder-url into main

Summary

  • include the configured host subfolder in OAuth authorization URLs
  • trim surrounding slashes while preserving nested subfolders
  • add a regression test for a self-managed nested subfolder

Testing

  • go test ./internal/oauth2

Closes #8399 (closed)

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