[installinator] allow more generic data over the wire #9304
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Before marking this API client-side-versioned (#9295), let's ensure forward compatibility for installinator by allowing us to send more generic data over the wire. This will allow new versions of installinator to work transparently against old versions of wicketd.
Wicketd does need access to structured installinator data in one spot, and we can deserialize just that part of metadata. All other data involved is just for internal bookkeeping within a service (doesn't have to transcend version boundaries), and for human consumption in the UI.
There are no changes to the wire protocol, just to how it gets deserialized on the server.