chore: Adds theme object to chart properties (#19951)

superset-frontend/plugins/plugin-chart-echarts/test/BigNumber/transformProps.test.ts

@@ -16,7 +16,11 @@
  * specific language governing permissions and limitations
  * under the License.
  */
-import { DatasourceType, TimeGranularity } from '@superset-ui/core';
+import {
+  DatasourceType,
+  supersetTheme,
+  TimeGranularity,
+} from '@superset-ui/core';
 import transformProps from '../../src/BigNumber/BigNumberWithTrendline/transformProps';
 import {
   BigNumberDatum,
@@ -89,6 +93,7 @@ function generateProps(
     ownState: {},
     filterState: {},
     behaviors: [],
+    theme: supersetTheme,
   };
 }