fix: ignore case when matching function name #19403

Job	Run time
changes	16s
linux / check	4s
linux / build_udf (x86_64, X64)	1s
linux / build (x86_64, X64)	4s
linux / test_unit	1s
linux_hive / build (x86_64, gnu)	1s
linux_hive / test_stateful_hive_standalone	1s
linux / test_compat_meta_query	1s
linux / test_metactl	1s
linux / test_compat_fuse	1s
linux / test_compat_meta_meta	1s
linux / test_logs	1s
linux / test_meta_cluster	1s
linux / test_stateless_standalone	1s
linux / test_stateful_cluster	1s
linux / test_stateful_standalone	1s
linux / test_stateless_cluster	1s
linux / test_ee_standalone	1s
linux / test_stateful_iceberg_rest	1s
linux / test_stateful_large_data	1s
linux / sqllogic	1s
linux / test_ee_management_mode	1s
linux / test_ee_standalone_background	1s
ready	2s
	46s

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