Support `<gazebo_ros>` in `package.xml` exports #1401

Job	Run time
ros_gz CI (ubuntu:22.04, fortress, humble)	11m 22s
ros_gz CI (ubuntu:22.04, garden, humble)	10m 33s
ros_gz CI (ubuntu:22.04, harmonic, humble)	10m 42s
ros_gz CI (ubuntu:22.04, fortress, rolling)	12m 25s
ros_gz CI (ubuntu:22.04, garden, rolling)	10m 14s
ros_gz CI (ubuntu:22.04, harmonic, rolling)	12m 12s
	1h 7m 28s

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