Change to `workflow::in qa` when assigned to QA

Refer To

https://jihulab.com/gitlab-cn/gitlab/-/issues/1059#note_602401

Condition

1. When issue have no ~"type::qa"(Because these issues don't need DEV to process)
2. When issue is assigned to QA.

Action

1. Add workflowin qa

/cc @qianzhangxa @TomHeng