GLAM try egrep for table fitering + more specific pattern (#5235)

* GLAM try egrep for table fitering

* More precise label pattern

script/glam/generate_glean_sql

@@ -66,7 +66,7 @@ function write_clients_daily_aggregates {
     tables=$(
         bq ls "$qualified" \
         | grep TABLE \
-        | grep 'glean_ping_\d\+' \
+        | grep -E 'schema_id:glean_ping_\d+' \
         | grep -v use_counters \
         | awk '{print $1}'
     )