[GPU] Add coalescing to reduction tiling #47400

Job	Run time
setup / setup	11s
runtime_small	3m 14s
runtime :: macos-14	1m 42s
runtime :: windows-2022	10m 14s
runtime :: ubuntu-24.04-arm	1m 42s
runtime_tracing :: windows-2022 :: console	9m 20s
runtime :: ubuntu-24.04	1m 45s
runtime_tracing :: ubuntu-24.04 :: console	1m 21s
runtime_tracing :: ubuntu-24.04-arm :: console	1m 16s
runtime_tracing :: windows-2022 :: tracy	9m 11s
runtime_tracing :: macos-14 :: tracy	1m 32s
runtime_tracing :: ubuntu-24.04 :: tracy	1m 23s
runtime_tracing :: ubuntu-24.04-arm :: tracy	1m 15s
runtime_tracing :: macos-14 :: console	1m 47s
linux_x64_clang / linux_x64_clang	28m 1s
linux_x64_clang_asan / linux_x64_clang_asan	32m 24s
linux_x64_bazel / linux_x64_bazel	37m 13s
linux_arm64_clang	0s
linux_x64_clang_ubsan / linux_x64_clang_ubsan	32m 52s
macos_arm64_clang	0s
macos_x64_clang	0s
linux_x64_gcc	0s
linux_x64_clang_tsan	0s
windows_x64_msvc	0s
linux_x64_clang_byollvm	0s
linux_x64_clang_debug	0s
ci_summary / summary	15m 2s
	3h 11m 25s

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