NocoBase v1.8.0-alpha.7: support email sync interval setting

🎉 New Features

• [Email manager] support email sync interval setting by @jiannx

🐛 Bug Fixes

• [database] make eq operator for string fields compatible with number type (#7062) by @chenos

• [client] Fix upload size hint (#7057) by @mytharcher

• [Workflow: Approval] Fix trigger variable when filter by type by @mytharcher