Add support for custom HTML attributes in ActionProps of Message

[aakankshabhende]

Support for passing custom HTML attributes (especially data-*) to ActionProps of Message is particularly useful for integrating with tools such as Pendo, analytics platforms, or automation testing frameworks.

https://www.patternfly.org/patternfly-ai/chatbot/chatbot-messages#actionprops

[rebeccaalpert]

That's valid - looks like we can pass these, but don't actually do the pass-through. Should be easy to fix!