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proto: Deprecate `root_oid` field in the TreeEntry message

Patrick Steinhardt requested to merge pks-find-tree-entries-deprecate-root-oid into master

The TreeEntry message we're returning from the GetTreeEntries() RPC contains a root_oid field. This field always points to the tree ID of the commit via which GetTreeEntries() arrived at the tree. This design is quite weird, as the root OID would be the same for every single tree entry returned by that RPC call. Furthermore, this field requires us to spawn a separate Git process only to resolve that object ID and thus slows down overall latency of the RPC.

Deprecate the field so that we can remove it in release 16.0. It is not known to be used by any clients anyway.

Part of #4823 (closed).

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