[release 4-15] Tables in dashboards are not merging multiple query responses correctly

A table in a dashboard relies on the order of the metric labels to merge results

How to Reproduce:

Create a dashboard with a table including this query:

label_replace(sort_desc(sum(sum_over_time(ALERTS{alertstate="firing"}[24h])) by ( alertstate, alertname)), "aaa", "$1", "alertstate", "(.+)") 

A single row will be displayed as the query is simulating that the first label `aaa` has a single value.

Expected result:

The table should not rely on a single metric label to merge results but consider all the labels so the expected rows are displayed.