Add `graph` alias for `rad app connections` #4076

Job	Run time
Build Radius for test	9m 3s
Run ucp functional tests	7m 15s
Run shared functional tests	15m 41s
Run msgrp functional tests	8m 28s
Run daprrp functional tests	10m 45s
Run samples functional tests	8m 17s
Run datastoresrp functional tests	7m 21s
Report test failure	0s
	1h 6m 50s

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