Remove passed freshmen from the 10weeks ldap group after passing 10 weeks

There is now a `10weeks` ldap group, to help show and determine who is currently in the 10 weeks process to services. Members should be removed from this upon passing a 10 weeks but remain in the `intromembers` group until they pass a spring evaluations

issue 中沒有指定檔案或測試。首先定位管理 LDAP 群組 `10weeks` 和 `intromembers` 的 Python 程式碼，然後追蹤成員如何通過 10 週流程。完成標準是：成員通過後從 `10weeks` 中移除，但在春季評估之前仍保留在 `intromembers` 中。

由索引模型根據 Issue 內容生成。