Github repos page License display with Unknown licenses found

[casionone]

repos index page https://github.com/apache/incubator-linkis

the txt of license-header [license-header](https://github.com/apache/incubator-linkis/blob/master/license-header)

According to the official documentation, it should be identified by the license name file

https://docs.github.com/cn/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/licensing-a-repository

maybe we should move this filelicense-header in subdirectory

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