NocoBase v1.5.16: Allow restoring backup to an application even it is missing some plugins

🚀 Improvements

• [Backup manager] Allow restoring backup to an application even it is missing some plugins by @gchust

🐛 Bug Fixes

• [client] rich text field component cannot be fully cleared (#6287) by @katherinehhh

• [File manager]

  • Fix migration and add test cases (#6288) by @mytharcher

  • Fix path column type of file collection (#6294) by @mytharcher

  • Fix migration and add test cases (#6288) by @mytharcher