Describe the Bug

Currently if a file contains an import that is only referenced in __all__ it is incorrectly flagged as unused. References in __all__ should count as usage as this is a very common pattern when exporting from a package's __init__.py.

Sandbox Link

https://pyrefly.org/sandbox/?project=N4IgZglgNgpgziAXKOBDAdgEwEYHsAeAdAA4CeSIAxAAQDqMUAxrgLYzUAuunAFuwAqkATjDBRS1AMoYcBADS8IcakuqpqxVAHMYAHXQ0A7nxHVSuAK7VGGaoaEQOMBXB6pTM6rHfo1eCxycpMQQ6FoqvoIcPLjohPqUCdQAEjAeHtaWxLDUYDCoHBYiyrhgispoWHj4iEkAtNQA4jCBIqhQdRwQbEHE7Ix8jADWoeF5MDiow-XUAKpw7CIAbvlQAPocwTAAFACUnNyhcH2MgaF5QiKYvfAzMPh9DmzogYaOPLzsAJIAIgCiuXyhWKvAKdnYcAsxGIuCEgW2MEIWkIagCuGYLGyLWc1C0uE6%2BMwolCjggsQUMRWQgULUYuxmtAcTjUWGoQgskVI0VimSJ1EwEBEp3EETMliE1GwQlwhgWQn0%2BjA0pY1AC0GU3RhcNysJYBTW6AsLGwaQV6DWa3a6zW1AAvNQANq6cC6-WG42mkAAXRAchAaqgcBI5EQVDmXSgjgkYA5pzJ6DgZqJZTAro4BqNJqE2xqEQ4%2BzqAD5qHAOEJar5qFWRMDfGBnQA5TNpRDUYD4AC%2Bzv0vpAZBEYlIhC4LCgFBoggHIsqsnwmXQkC0RQK8fiBikMHYPA4HGIcEQAHoD-3ROJCLCtAeYOgD5h0XAD8wFxAl0IV7EDzqJaglqhoKhsByJ9F2XLoeVwYgwITNcyG5dA6ipOB4ztahnQAZkIABGAAmbt0BADs-SmLoVgAMWgGAKBnapgwIoA

(Only applicable for extension issues) IDE Information

No response