remove agg_metric_v0 from one spot because the test doesn't actually use agg_metric

Author: limotova

x-pack/plugin/esql/qa/testFixtures/src/main/resources/k8s-timeseries-increase.csv-spec

@@ -133,7 +133,6 @@ increase_bytes:double | cluster:keyword | time_bucket:datetime     | increase_kb
 increase_of_aggregate_metric
 required_capability: increase
 required_capability: ts_command_v0
-required_capability: aggregate_metric_double_v0
 TS k8s-downsampled
 | STATS sum_bytes = sum(increase(network.total_bytes_in)),
         max_bytes = max(increase(network.total_bytes_in)),