Remove mirror stream on update to NATS 2.10

[thomastaylor312]

In #79 we added some things around a mirror stream for combining streams. In NATS 2.10, we will be able to have multiple filter subjects and won't need it any more. So once we update, we should remove the need for a mirror stream

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. If this has been closed too eagerly, please feel free to tag a maintainer so we can keep working on the issue. Thank you for contributing to wasmCloud!

[connorsmith256]

@thomastaylor312 was this okay to close as stale?

[thomastaylor312]

Nope. Let me label

[brooksmtownsend]

Done in https://github.com/wasmCloud/wadm/pull/310