GroupByVariable: Add support for default values in schema (#105518)

* update schema

* update schema

* refactor property to singular naming

* bump scenes

* leave scenes to caret version

* add defaultValue to groupBy model

* typo

packages/grafana-data/src/types/templateVars.ts

@@ -78,6 +78,7 @@ export interface GroupByVariableModel extends VariableWithOptions {
   datasource: DataSourceRef | null;
   multi: true;
   allowCustomValue?: boolean;
+  defaultValue?: VariableOption;
 }
 
 export interface VariableOption {

packages/grafana-schema/src/schema/dashboard/v2alpha1/types.spec.gen.ts

@@ -1290,6 +1290,7 @@ export const defaultGroupByVariableKind = (): GroupByVariableKind => ({
 export interface GroupByVariableSpec {
 	name: string;
 	datasource?: DataSourceRef;
+	defaultValue?: VariableOption;
 	current: VariableOption;
 	options: VariableOption[];
 	multi: boolean;