Build

Switch all search paths to FastScanCodeScanner and remove make_knn_handler #4433

Job	Run time
build-pull-request / Format	37s
build-pull-request / Linux x86_64 (cmake)	22m 4s
build-release	-1s
build-pull-request / Linux x86_64 AVX512_SPR (cmake)	39m 5s
build-pull-request / Linux x86_64 AVX512 (cmake)	38m 51s
build-pull-request / Linux x86_64 AVX2 (cmake)	21m 59s
build-pull-request / Linux x86_64 GPU w/ cuVS (cmake)	1h 44m 48s
build-pull-request / Linux x86_64 Dynamic Dispatch (cmake)	31m 47s
build-pull-request / Linux arm64 SVE (cmake)	24m 59s
build-pull-request / Linux x86_64 GPU (cmake)	44m 39s
build-pull-request / Windows x86_64 (conda)	25m 6s
build-pull-request / Linux x86_64 w/ SVS (cmake)	22m 53s
build-pull-request / Linux x86_64 (conda)	28m 10s
build-pull-request / Linux arm64 Dynamic Dispatch (cmake)	19m 35s
build-pull-request / Linux arm64 (conda)	1h 53m 12s
build-pull-request / Index serialization backward compatibility / Conda Write -> CMake Read	27m 20s
build-pull-request / Index serialization backward compatibility / CMake Write -> Conda Read	25m 43s
	9h 50m 47s

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