[NFC] Drop `string_makers.h` #3129

Job	Run time
check-secrets	3s
check-clang-format	35s
compile-cts (dpcpp, 2025-05-01)	5h 0m 0s
build-common-base-image	-1s
compile-cts (simsycl, 27ca7a05e65d24c784ba831225d0a53341719590)	52m 17s
compile-cts (adaptivecpp, 061e2d6ffe1084021d99f22ac1f16e28c6dab899)	1h 13m 40s
build-image-for-sycl-impl	-1s
cts-compiles-for-all-implementations	2s
	7h 6m 35s

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