trunk/90769ae442226c087d2faf307a9be834c5c645e0: Add Auto PR Triage in shadow mode (#195778)

发生了什么

NOTE: Auto PR Triage has been mostly rewritten since the previous review. Human written reviewer guide: Job split (This also captures what changed between the previous version. We're still doing the same analysis apply split, but the previous version had a much more complex apply stage. In this split, apply is a simple executor and carries out zero policy logic. This makes shadow mode much more simpler) The auto pr…

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