Test qlib from source slow

Fix the bug of reading string NA as NaN in the function exists_qlib_data. #1291

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Job	Run time
build (windows-latest, 3.7)	26m 21s
build (windows-latest, 3.8)	23m 48s
build (ubuntu-20.04, 3.7)	16m 4s
build (ubuntu-20.04, 3.8)	14m 4s
build (ubuntu-22.04, 3.7)	16m 3s
build (ubuntu-22.04, 3.8)	14m 48s
build (macos-11, 3.7)	54m 59s
build (macos-11, 3.8)	43m 32s
build (macos-latest, 3.7)	27m 36s
build (macos-latest, 3.8)	17m 6s
	4h 14m 21s