[PP-1] Add test coverage for Experience builder AI submodule.

Tool tests are already covered as part of 🐛 External AI Chatbot Functionality Active . We still need to decide what additional test coverage is needed for this issue.
We probably need to write tests that override the actual response of modules/xb_ai/src/Controller/XbBuilder.php and test it on the front-end.

kunal.sachdev → made their first commit to this issue’s fork.

tim.plunkett → made their first commit to this issue’s fork.