Add prefixed bucket on all e2e tests for S3

The idea is that if it works, we can add for all other providers.
Signed-off-by: jademcosta <jade.costa@nubank.com.br>

pkg/objstore/objtesting/foreach.go

@@ -95,6 +95,7 @@ func ForeachStore(t *testing.T, testFn func(t *testing.T, bkt objstore.Bucket))
 			// This needs to be investigated more.
 
 			testFn(t, bkt)
+			testFn(t, objstore.NewPrefixedBucket(bkt, "some_prefix"))
 		})
 	}