[NFC] Drop code related to `error_category_for` #2539

Job	Run time
check-secrets	1s
check-clang-format	3s
build-common-base-image	0s
build-image-for-sycl-impl	0s
compile-cts (dpcpp, 1dbee22f9c8a3a825deb871bab76937e04fa26fc)	1h 11m 58s
compile-cts (hipsycl, 3d8b1cd)	48s
cts-compiles-for-all-implementations	1s
	1h 12m 51s

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