Create or update pull request external properties. The patch operation can be `add`, `replace` or `remove`. For `add` operation, the path can be empty. If the path is empty, the value must be a list of key value pairs. For `replace` operation, the path cannot be empty. If the path does not exist, the property will be added to the collection. For `remove` operation, the path cannot be empty. If the path does not exist, no action will be performed.
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Get external properties of the pull request.