sumengwang

[CDAP-20279] (SCM) change namespace admin looks

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# [CDAP-20279] change namespace admin looks ## Description * styles change * can add new namespace in namespace admin * can switch namespace in namespace admin figma: https://www.figma.com/file/zHJixa1FDNux4upVFJdnFh/Lifecycle-Management-CDF-Pipelines?node-id=942%3A3672&t=vRG1tKhIaI6P1JeJ-0 ## PR...