[cuda backend] optimized L_kv threshold for sdpa implementation selec… #7933

Job	Run time
Get changed files / get-changed-files	3s
test-coreml / test-backend-macos (coreml_static_int8, models) / macos-job	26m 24s
test-coreml / test-backend-macos (coreml, models) / macos-job	14m 31s
test-coreml / test-backend-macos (coreml, operators) / macos-job	11m 59s
test-coreml / test-backend-macos (coreml_static_int8, operators) / macos-job	3h 0m 47s
test-coreml / test-backend-linux	0s
test-coreml / package-golden-artifacts	0s
	3h 53m 44s

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