Testdata: Rename package to circumvent convention in go (#19409)

Before this change the tests for test datasource was not run.

pkg/tsdb/testdatasource/testdata.go

@@ -0,0 +1,42 @@
+package testdatasource
+
+import (
+	"context"
+
+	"github.com/grafana/grafana/pkg/infra/log"
+	"github.com/grafana/grafana/pkg/models"
+	"github.com/grafana/grafana/pkg/tsdb"
+)
+
+type TestDataExecutor struct {
+	*models.DataSource
+	log log.Logger
+}
+
+func NewTestDataExecutor(dsInfo *models.DataSource) (tsdb.TsdbQueryEndpoint, error) {
+	return &TestDataExecutor{
+		DataSource: dsInfo,
+		log:        log.New("tsdb.testdata"),
+	}, nil
+}
+
+func init() {
+	tsdb.RegisterTsdbQueryEndpoint("testdata", NewTestDataExecutor)
+}
+
+func (e *TestDataExecutor) Query(ctx context.Context, dsInfo *models.DataSource, tsdbQuery *tsdb.TsdbQuery) (*tsdb.Response, error) {
+	result := &tsdb.Response{}
+	result.Results = make(map[string]*tsdb.QueryResult)
+
+	for _, query := range tsdbQuery.Queries {
+		scenarioId := query.Model.Get("scenarioId").MustString("random_walk")
+		if scenario, exist := ScenarioRegistry[scenarioId]; exist {
+			result.Results[query.RefId] = scenario.Handler(query, tsdbQuery)
+			result.Results[query.RefId].RefId = query.RefId
+		} else {
+			e.log.Error("Scenario not found", "scenarioId", scenarioId)
+		}
+	}
+
+	return result, nil
+}