Remove unused s32 -> f32 convert kernels #4116

Job	Run time
build-and-test / cmake-linux-armhf	6m 10s
build-and-test / cmake-linux-aarch64	6m 48s
build-and-test / cmake-linux-riscv64	6m 42s
build-and-test / cmake-linux-x86_64	9m 6s
build-and-test / bazel-linux-aarch64-clang18	8m 18s
build-and-test / bazel-linux-aarch64-gcc13	7m 23s
build-and-test / bazel-linux-x86_64-clang-18	11m 47s
build-and-test / bazel-linux-x86_64-gcc-9	6m 56s
build-and-test / cmake-android (arm64)	7m 28s
build-and-test / cmake-android (armv7)	6m 29s
build-and-test / cmake-ios-arm64	3m 31s
build-and-test / cmake-ios-x86_64	5m 42s
build-and-test / cmake-android (x86)	8m 43s
build-and-test / cmake-linux-riscv64-rvv	12m 46s
build-and-test / cmake-macos-arm64	10m 14s
build-and-test / cmake-windows-arm64	2m 49s
build-and-test / cmake-windows-x64	5m 18s
build-and-test / cmake-windows-x86	5m 47s
	2h 11m 57s

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