Update `root_group` extension tests to use new query API #2889

Job	Run time
check-secrets	1s
check-clang-format	3s
build-common-base-image	0s
build-image-for-sycl-impl	0s
compile-cts (dpcpp, ca955e538171cb7b7eb07734dd5c2b958c84901c)	8m 12s
compile-cts (adaptivecpp, 061e2d6ffe1084021d99f22ac1f16e28c6dab899)	2m 34s
cts-compiles-for-all-implementations	1s
	10m 51s

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