CloudWatch: Change aggregateResponse to return slice instead of map (#48805)

* Rename tests

* Change test names

* Change metrics from map to slice

* Add test for one output, multiple MetricDataResults

* Rename test input file

* Use map instead of iterating over the response metrics

* Rename variable

* move partial data set to query row response

* remove not used label field

* remove incorrect placeholder

Co-authored-by: Erik Sundell <erik.sundell87@gmail.com>

public/app/plugins/datasource/cloudwatch/components/MetricsQueryEditor/MetricsQueryEditor.tsx

@@ -140,7 +140,6 @@ export const MetricsQueryEditor = (props: Props) => {
           >
             <Input
               id={`${query.refId}-cloudwatch-metric-query-editor-label`}
-              placeholder="auto"
               onBlur={onRunQuery}
               value={preparedQuery.label ?? ''}
               onChange={(event: ChangeEvent<HTMLInputElement>) =>