feat(events): forward the tenant configuration as part of the kafka message

[lsampras]

In a previous issue we've added tenant id to kafka events so that it can be used in downstream clickhouse,

But due to recent changes the tenant_id won't be used as a unique identifier on clickhouse and instead we need to pass in the entire Tenant object to kafka store,

with this the underlying KafkaProducer will accept a Tenant as well and send the clickhouse_database property from it as a field.

[lsampras]

This changes need to be added in the existing #4867 PR