Add genAI Chatbot in Backstage with AWS GenAI plugin

Backstage is the single pain of glass and having a chatbot that helps them is an IDP capability to provide to developers

For platform engineers they can learn how to put together AI Agents and Tools to build a chatbot for their IDP

References:
- AWS GenAI Backstage plugin https://github.com/awslabs/backstage-plugins-for-aws/tree/main/plugins/genai
- Demo at BackstageCon NA of the plugin https://www.youtube.com/watch?v=DCXzCrIDOAs

Start by reviewing the AWS GenAI Backstage plugin reference and its BackstageCon demo. Then inspect this repository for an existing Backstage integration or entry point; the issue does not name files, tests, or acceptance criteria, so confirm the desired scope and what a completed chatbot integration should demonstrate before starting.

Written by the indexing model from the issue text.