Deprecate querier.ingester-streaming flag and always use QueryStream #5815
Description
Deprecate flag querier.ingester-streaming which enables Ingester Query Streaming.
This will also remove the Query method from the Distributor Read interface
https://github.com/cortexproject/cortex/blob/master/pkg/querier/distributor_queryable.go#L29C2-L29C7.
This flag was also marked as the default option 4 years ago in https://github.com/cortexproject/cortex/pull/2344/files#diff-06572a96a58dc510037d5efa622f9bec8519bc1beab13c9f251e97e657a9d4edR55.
It should be the time to always turn it on to remove some unnecessary code.
The plan is to mark this flag as deprecated in v1.17.0 and totally remove it in v1.19.0.