Add missing tests for `multi_ptr` aliases for `access::address_space::generic` #2765

Job	Run time
check-clang-format	3s
check-secrets	1s
build-common-base-image	0s
build-image-for-sycl-impl	0s
compile-cts (dpcpp, 20a088e1231c4ac85fd74c0de79c563977d2f38c)	3h 22m 18s
compile-cts (hipsycl, 3d8b1cd)	2m 52s
cts-compiles-for-all-implementations	1s
	3h 25m 15s

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