fix(multi-tenancy): fix live loader for case when namespace does not exist for data #7505
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Fixes DGRAPH-3075
Earlier, when live-loading data through Guardians of Galaxy, the NQuads make their way to the DB even if the namespace does not exist for them. This might lead to very interesting bugs.
This PR fixes it by extracting the namespaces by querying the schema. If we encounter a Nquad or schema for which namespace does not exist, we error out and live loader stops.
This change is