Refactor `vector_swizzles` test #2471

Job	Run time
check-secrets	1s
check-clang-format	7s
build-common-base-image	0s
build-image-for-sycl-impl	0s
compile-cts (dpcpp, c4db251179dcd1b30a1043d4780634dbe39b3e3a)	35m 6s
compile-cts (hipsycl, 3d8b1cd)	47s
cts-compiles-for-all-implementations	1s
	36m 2s

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