Resolve "取消 ~"type::qa" label"

What does this MR do and why?

1. 修改 triage/config/jihu_labels.yml， 移除 ~"type::qa"，新增一些 ~"qa::" 相关 label
2. triage/triage/event.rb 添加新函数 has_qa_label?
3. 修改 TypeLabelReminder 的触发条件，调整相关的 spec
4. 修改 AddLabelWhenAssignToQa 的触发条件，调整相关的 spec

Related to #104 (closed)