usage for remote agent is not showing up

[peterj]

this is based on our non-remote stats under kagent_usage_metadata and other possible fields that usage would be stored in for remote agents.

we could:

1. Add fields for remote type so a user can configure the metadata field(s) for this data (if exposed).
2. Keep as-is
3. [?] Come back to this after figuring out the streaming + Task/history setup.

Originally posted by @inFocus7 in #821 (comment)

[github-actions]

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