Fix/agentflow fix field name mismatch between SDK internal representation and server expectation (#6092)

* Intial changes

* Test changes

* Fix gemini suggestion

* revert changes to RichTextEditor

* Changes to create a common base class for NodeData and NodeDataBase

* Fix TS error

* Revert all changes to RichTextEditor

* Fixed comments in nodeFactory.ts

* Remove migration code

* Removed unwanted change in behaviour

* Remove all changes to RichTextEditor and test

* Rename NodeDataBase to NodeDataSchema