sql: correctly set inner plan for leafTxn when resuming flow for portal

When resuming a portal, we always reset the planner. However we still need the
planner to respect the outer txn's situation, as we did in #98120.

Release note: None

pkg/sql/planner.go

@@ -283,7 +283,11 @@ func (p *planner) resumeFlowForPausablePortal(recv *DistSQLReceiver) error {
 	}
 	recv.discardRows = p.instrumentation.ShouldDiscardRows()
 	recv.outputTypes = p.pausablePortal.pauseInfo.resumableFlow.outputTypes
-	p.pausablePortal.pauseInfo.resumableFlow.flow.Resume(recv)
+	flow := p.pausablePortal.pauseInfo.resumableFlow.flow
+	finishedSetupFn, cleanup := getFinishedSetupFn(p)
+	finishedSetupFn(flow)
+	defer cleanup()
+	flow.Resume(recv)
 	return recv.commErr
 }