Revert "[8.x] [ES|QL] ToAggregateMetricDouble function (elastic#124595) (elastic#125172)" (elastic#125277)

This reverts commit 6979cad.

Adjusting the TransportVersion introduced in this commit for backporting
is nontrivial so I am reverting this until we come up with an approach
for it.

Author: limotova

docs/changelog/124595.yaml

@@ -196,7 +196,6 @@ static TransportVersion def(int id) {
     public static final TransportVersion ML_INFERENCE_DEEPSEEK_8_19 = def(8_841_0_09);
     public static final TransportVersion ESQL_SERIALIZE_BLOCK_TYPE_CODE = def(8_841_0_10);
     public static final TransportVersion ESQL_FAILURE_FROM_REMOTE = def(8_841_0_11);
-    public static final TransportVersion ESQL_AGGREGATE_METRIC_DOUBLE_LITERAL = def(8_841_0_12);
 
     /*
      * STOP! READ THIS FIRST! No, really,