feat: Remove OIDC and SSO support

Existing SSO accounts have no local password, so the migration
deactivates them before dropping is_sso_user and the
identity_provider_user table.

server/config/routes.js

@@ -117,8 +117,6 @@ module.exports.routes = {
   'DELETE /api/webhooks/:id': 'webhooks/delete',
 
   'POST /api/access-tokens': 'access-tokens/create',
-  'POST /api/access-tokens/exchange-with-oidc': 'access-tokens/exchange-with-oidc',
-  'POST /api/access-tokens/debug-oidc': 'access-tokens/debug-oidc',
   'POST /api/access-tokens/accept-terms': 'access-tokens/accept-terms',
   'POST /api/access-tokens/revoke-pending-token': 'access-tokens/revoke-pending-token',
   'DELETE /api/access-tokens/me': 'access-tokens/delete',