Fix/agentflow Integration and verification test fixes (#6175)

* Fix JSON inout button not appearing

* Fix to display icons for vector embeddings and tools in Agent node

* Add variable syntax support to condition node

* Clear out existing values when operation is changed in Condition node

* Loop node  to show ancestral nodes

* Fix position and styling of "See Example"

* Refactor AsyncInput to remove duplicate logic

* Fix gemini comments

* Addressed review comments