Nocobase v1.4.0-alpha.7: Support delimiters properties for variable expression component

🎉 New Features

• [client] support delimiters properties for variable expression component (#5620) by @mytharcher

• [Workflow] support to move downstream nodes into new branches when creating node with branches (#5570) by @mytharcher

🚀 Improvements

• [client]

  • optimize field list: remove relation fields and Duplicate tag (#5616) by @katherinehhh

  • support getFilterTargetKey() from Collection class (#5617) by @mytharcher

• [Data source: Main] refactor the collections

  api to improve performance (#5610) by @chareice

• [Notification manager] improve notification channel manager UI (#5621) by @sheldon66