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feat: remove upstreams/downstreams from UpsertEntity, unify edge API

All relationships including data lineage are now sent as edges via
UpsertEdge. Remove UpsertWithEdges service method and the special
handling that converted upstreams/downstreams arrays into lineage
edges. Regenerate protos from updated proton that removes the
upstreams/downstreams fields from UpsertEntityRequest.

Edge types are now descriptive:
- derived_from: entity depends on target (view from table, dashboard
  from datasource)
- generates: entity produces target (job writes to downstream)
- owned_by, member_of, belongs_to, references, consumed_by