[full-ci] More cache cleanup (#6134)

* Make env var names consistent with the others

* Remove unused OCS cache

* Use the same cache database for shared caches

* Bump reva

services/storage-system/pkg/config/defaults/defaultconfig.go

@@ -52,7 +52,7 @@ func DefaultConfig() *config.Config {
 		},
 		Cache: config.Cache{
 			Store:    "memory",
-			Database: "system",
+			Database: "ocis",
 		},
 	}
 }