delete migration files

Author: odelcroi

crates/storage-pg/migrations/20250311090920_upstream_oauth_providers_allow_existing_users.sql

@@ -11,7 +11,6 @@ upstream_oauth_links:
     user_id: 00000000-0000-0000-0000-000000000001
 upstream_oauth_providers:
   - additional_parameters: ~
-    allow_existing_users: "false"
     authorization_endpoint_override: ~
     brand_name: ~
     claims_imports: "{}"