Fixes: Added session variable types and modified configuration (#11269)

### What problem does this PR solve?

Fixes: Added session variable types and modified configuration

- Added more types of session variables
- Modified the embedding model switching logic in the knowledge base
configuration

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/locales/en.ts

@@ -1009,6 +1009,7 @@ Example: general/v2/`,
       pleaseUploadAtLeastOneFile: 'Please upload at least one file',
     },
     flow: {
+      formatTypeError: 'Format or type error',
       variableNameMessage:
         'Variable name can only contain letters and underscores',
       variableDescription: 'Variable Description',