Use strong types for AssistPipelineRunStart and AssistPipelineSttEnd

[TimoPtr]

This two types contains a Map<String, Any?> but we are always expecting a specific field. We should avoid use Any as much as we can and here in this case we can simply create the proper class and replace the type of the fields by these new classes.

[smithrashell]

Hello @TimoPtr,
I’d love to work on this issue if it’s still available. Could you please assign it to me

[TimoPtr]

Hey @smithrashell, sure you can do it on top of this PR #5279 (comment) or wait for it to be merged.

[smithrashell]

Thanks, @TimoPtr! I’ll go ahead and base my work on top of PR #5279 as suggested.