Change PR to draft when it is (re)opened (#36417)
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
* draft
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Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>