AzureMonitor: Fix logs query multi-resource and timespan values (#67914)

* Update TimeGrain interface methods

- Make them util functions because it's simpler

* Update logs ds to appropiately set resources and timespan

* Set timespan using RCF times

* Update tests

pkg/tsdb/azuremonitor/loganalytics/azure-log-analytics-datasource_test.go

@@ -872,7 +872,7 @@ func TestLogAnalyticsCreateRequest(t *testing.T) {
 		if !cmp.Equal(req.Header, expectedHeaders) {
 			t.Errorf("Unexpected HTTP headers: %v", cmp.Diff(req.Header, expectedHeaders))
 		}
-		expectedBody := `{"query":"Perf"}`
+		expectedBody := `{"query":"Perf","timespan":"0001-01-01T00:00:00Z/0001-01-01T00:00:00Z"}`
 		body, err := io.ReadAll(req.Body)
 		require.NoError(t, err)
 		if !cmp.Equal(string(body), expectedBody) {
@@ -887,7 +887,28 @@ func TestLogAnalyticsCreateRequest(t *testing.T) {
 			Query:     "Perf",
 		})
 		require.NoError(t, err)
-		expectedBody := `{"query":"Perf","resources":["r1","r2"]}`
+		expectedBody := `{"query":"Perf","timespan":"0001-01-01T00:00:00Z/0001-01-01T00:00:00Z","workspaces":["r1","r2"]}`
+		body, err := io.ReadAll(req.Body)
+		require.NoError(t, err)
+		if !cmp.Equal(string(body), expectedBody) {
+			t.Errorf("Unexpected Body: %v", cmp.Diff(string(body), expectedBody))
+		}
+	})
+
+	t.Run("creates a request with timerange from query", func(t *testing.T) {
+		ds := AzureLogAnalyticsDatasource{}
+		from := time.Now()
+		to := from.Add(3 * time.Hour)
+		req, err := ds.createRequest(ctx, logger, url, &AzureLogAnalyticsQuery{
+			Resources: []string{"r1", "r2"},
+			Query:     "Perf",
+			TimeRange: backend.TimeRange{
+				From: from,
+				To:   to,
+			},
+		})
+		require.NoError(t, err)
+		expectedBody := fmt.Sprintf(`{"query":"Perf","timespan":"%s/%s","workspaces":["r1","r2"]}`, from.Format(time.RFC3339), to.Format(time.RFC3339))
 		body, err := io.ReadAll(req.Body)
 		require.NoError(t, err)
 		if !cmp.Equal(string(body), expectedBody) {