Add `graph` alias for `rad app connections` #4083

Job	Run time
Build Radius for test	9m 51s
Build Radius for test	9m 51s
Run ucp functional tests	7m 30s
Run ucp functional tests	7m 30s
Run kubernetes functional tests	8m 19s
Run kubernetes functional tests	8m 19s
Run shared functional tests	14m 30s
Run shared functional tests	14m 30s
Run msgrp functional tests	11m 9s
Run msgrp functional tests	11m 9s
Run daprrp functional tests	9m 45s
Run daprrp functional tests	9m 45s
Run samples functional tests	9m 2s
Run samples functional tests	9m 2s
Run datastoresrp functional tests	1s
Run datastoresrp functional tests	6m 39s
Report test failure	1s
Report test failure	0s
	2h 26m 53s

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