Summing over sum of two rates gives error "multiple matcher groups are not supported in GetShards"

[sophiewaldman]

Describe the bug
Error "multiple matcher groups are not supported in GetShards" when summing over sum of two rates.

To Reproduce
Loki version k316
Query: sum by (cluster,namespace)((rate({app="foo"}[1s]) + rate({app="bar"}[1s])))
Receive error failed to get shards for expression, got *status.statusError: rpc error: code = Code(500) desc = multiple matcher groups are not supported in GetShards. This is likely an internal bug as binary operations should be dispatched separately in planning: rpc error: code = Code(500) desc = multiple matcher groups are not supported in GetShards. This is likely an internal bug as binary operations should be dispatched separately in planning.

Expected behavior
The query should complete normally.

[sophiewaldman]

Resolved by #23445