extid topic is misconfigured in staging and production

The extid topic has the default configuration in staging and production:

• staging:

/opt/kafka/bin/kafka-topics.sh --bootstrap-server journal0.internal.staging.swh.network:9092 --describe --topic swh.journal.objects.extid 
Topic: swh.journal.objects.extid	PartitionCount: 1	ReplicationFactor: 1	Configs: max.message.bytes=104857600

• production:

/opt/kafka/bin/kafka-topics.sh --bootstrap-server kafka1.internal.softwareheritage.org:9092 --describe --topic swh.journal.objects.extid 
Topic: swh.journal.objects.extid	PartitionCount: 1	ReplicationFactor: 1	Configs: max.message.bytes=104857600

The cleanup policy need to be configured to compact and the partition count to 64 in staging and 256 in production. The replication also needs to be increased to 2 in production

For staging:

/opt/kafka/bin/kafka-topics.sh --zookeeper $ZK  --alter --topic swh.journal.objects.extid --config cleanup.policy=compact --partition 64

For production:

/opt/kafka/bin/kafka-topics.sh --zookeeper $ZK  --alter --topic swh.journal.objects.extid --config cleanup.policy=compact --partition 256 --replication-factor 2

The content of the topic needs to be back filed so the previous content will be cleaned after the next compact

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Migrated from T3485 (view on Phabricator)