chore(query): limit max concurrency of spill io requests (#16442) #51

Job	Run time
changes	19s
linux / build_udf (x86_64, X64)	1s
linux / build (x86_64, X64)	1s
linux / check	1s
linux / test_unit	1s
linux / test_compat_meta_query	0s
linux / test_compat_fuse	0s
linux / test_compat_meta_meta	0s
linux / test_metactl	0s
linux / test_logs	0s
linux / test_meta_cluster	0s
linux / test_stateless_cluster	0s
linux / test_stateless_standalone	0s
linux / test_stateful_cluster	0s
linux / test_stateful_iceberg_rest	0s
linux / test_stateful_large_data	0s
linux / test_stateful_standalone	0s
linux / sqllogic	0s
linux / test_ee_management_mode	0s
linux / test_ee_standalone	0s
linux / test_ee_standalone_background	0s
ready	2s
	25s

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