Feat: Allow the Rewrite operator to connect to the Generate operator #1739 (#5128)

### What problem does this PR solve?

Feat: Allow the Rewrite operator to connect to the Generate operator
#1739

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/flow/constant.tsx

@@ -670,7 +670,6 @@ export const RestrictedUpstreamMap = {
   [Operator.RewriteQuestion]: [
     Operator.Begin,
     Operator.Message,
-    Operator.Generate,
     Operator.RewriteQuestion,
     Operator.Relevant,
   ],