Loki: Add logsample supporting query type (grafana#92082)

* Loki: Add `logsample` supporting query type

* use `SupportingQueryType`

* add missing test

Author: svennergr

public/app/plugins/datasource/loki/datasource.test.ts

@@ -1529,6 +1529,7 @@ describe('LokiDatasource', () => {
           queryType: 'range',
           refId: 'log-sample-A',
           maxLines: 20,
+          supportingQueryType: SupportingQueryType.LogsSample,
         });
       });
 
@@ -1547,6 +1548,7 @@ describe('LokiDatasource', () => {
           queryType: LokiQueryType.Range,
           refId: 'log-sample-A',
           maxLines: 20,
+          supportingQueryType: SupportingQueryType.LogsSample,
         });
       });
 
@@ -1564,6 +1566,7 @@ describe('LokiDatasource', () => {
           expr: '{label="value"}',
           queryType: LokiQueryType.Range,
           refId: 'log-sample-A',
+          supportingQueryType: SupportingQueryType.LogsSample,
           maxLines: 5,
         });
       });

public/app/plugins/datasource/loki/datasource.ts

@@ -242,6 +242,7 @@ export class LokiDatasource
           refId: `${REF_ID_STARTER_LOG_SAMPLE}${normalizedQuery.refId}`,
           expr: getLogQueryFromMetricsQuery(expr),
           maxLines: Number.isNaN(Number(options.limit)) ? this.maxLines : Number(options.limit),
+          supportingQueryType: SupportingQueryType.LogsSample,
         };
 
       default: