Experimental: Remove tempo span-metrics generator

Author: mrnicegyu11

services/monitoring/tempo_config.yaml.j2

@@ -61,4 +61,4 @@ querier:
 overrides:
   defaults:
     metrics_generator:
-      processors: ['service-graphs', 'span-metrics', 'local-blocks']
+      processors: ['service-graphs', 'local-blocks']