Announce sharding in ruler and store proxy (#5560)

The ruler and store proxy currently support series sharding
through the components that they use. However, this capability is not
announced to the querier.

This commit modifies their Info calls to indicate to the querier
that it doesn't need to shard the response it receives from rulers
and other store proxies.

Signed-off-by: Filip Petkovski <filip.petkovsky@gmail.com>

cmd/thanos/query.go

@@ -666,8 +666,9 @@ func runQuery(
 				if httpProbe.IsReady() {
 					mint, maxt := proxy.TimeRange()
 					return &infopb.StoreInfo{
-						MinTime: mint,
-						MaxTime: maxt,
+						MinTime:          mint,
+						MaxTime:          maxt,
+						SupportsSharding: true,
 					}
 				}
 				return nil

cmd/thanos/rule.go

@@ -607,8 +607,9 @@ func runRule(
 				if httpProbe.IsReady() {
 					mint, maxt := tsdbStore.TimeRange()
 					return &infopb.StoreInfo{
-						MinTime: mint,
-						MaxTime: maxt,
+						MinTime:          mint,
+						MaxTime:          maxt,
+						SupportsSharding: true,
 					}
 				}
 				return nil