Fix Gitee import bugs

What does this MR do and why?

Fix Gitee import bugs, related issue https://jihulab.com/gitlab-cn/gitlab/-/issues/1818

• Gitee 中 Draft 状态的 MR 导入 Gitlab 后，未显示 Draft 前缀
• Issue 的截止日期未正常导入
• Release note 未正常被导入 Gitlab
• MR 中设置的 milestone 导入后未同步显示
• Milestone 的完成百分比导入后未正常显示
• Description 中换行在导入 Gitlab 后无法正常显示，包括 Wiki、Issue、MR
• “已拒绝”的 issue 应该变为“关闭”

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