Print change request ID in a way that can be consumed by the shell or invoking programs via output redirection when using `--draft`

[segevfiner]

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Issue details

When using --draft/--draft=new to create a new draft change request, the created ID is printed in the format Change request created: <id>, this is not very amenable to grabbing the ID via output redirection to later use it to submit further updates to the draft, e.g.

CHANGE_REQUEST_ID=$(pulumi env set --draft foo bar qux)
pulumi env set --draft=$CHANGE_REQUEST_ID foo bar2 qux2)
# And then this part seems missing from the CLI: pulumi env approve $CHANGE_REQUEST_ID

Affected area/feature

Pulumi ESC CLI