Build

Switch flat + IVF search to FastScanCodeScanner dispatch #4392

Job	Run time
build-pull-request / Linux x86_64 (cmake)	22m 7s
build-pull-request / Format	35s
build-release	-1s
build-pull-request / Linux x86_64 GPU (cmake)	2m 36s
build-pull-request / Linux x86_64 Dynamic Dispatch (cmake)	31m 3s
build-pull-request / Linux arm64 Dynamic Dispatch (cmake)	18m 55s
build-pull-request / Linux x86_64 GPU w/ cuVS (cmake)	1h 45m 47s
build-pull-request / Linux x86_64 AVX512 (cmake)	38m 31s
build-pull-request / Linux x86_64 AVX2 (cmake)	20m 25s
build-pull-request / Linux arm64 SVE (cmake)	23m 24s
build-pull-request / Linux x86_64 AVX512_SPR (cmake)	38m 32s
build-pull-request / Linux arm64 (conda)	2h 5m 35s
build-pull-request / Linux x86_64 w/ SVS (cmake)	23m 11s
build-pull-request / Windows x86_64 (conda)	25m 7s
build-pull-request / Linux x86_64 (conda)	27m 40s
build-pull-request / Index serialization backward compatibility / Conda Write -> CMake Read	24m 27s
build-pull-request / Index serialization backward compatibility / CMake Write -> Conda Read	25m 24s
	9h 13m 18s

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