Enable sdpa backends for server export in export.py #2560

Job	Run time
test-advanced-any / linux-job	17m 52s
test-advanced-cpu / linux-job	17m 40s
test-distributed-cuda / linux-job	9m 58s
test-evaluation-any / linux-job	17m 39s
test-evaluation-cpu / linux-job	17m 44s
test-gguf-cpu / linux-job	17m 41s
test-multimodal-any / linux-job	4m 12s
test-gguf-any / linux-job	17m 39s
test-multimodal-cpu / linux-job	4m 23s
test-native-any / linux-job	7m 0s
test-native-cpu / linux-job	7m 11s
test-quantization-any / linux-job	17m 59s
test-quantization-cpu / linux-job	17m 44s
test-readme-any / linux-job	12m 1s
test-readme-cpu / linux-job	11m 39s
	3h 18m 22s

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