fix notebook serialization issue for non-mssql providers (#22504)

* use mssql as notebook serialization provider

* comment

* use fallback

src/sql/platform/serialization/common/serializationService.ts

@@ -49,6 +49,8 @@ export interface ISerializationService {
 
 	hasProvider(): boolean;
 
+	isProviderRegistered(providerId: string): boolean;
+
 	saveAs(saveFormat: string, savePath: string, results: string, appendToFile: boolean): Thenable<azdata.SaveResultRequestResult>;
 
 	disabledSaveAs(): Thenable<azdata.SaveResultRequestResult>;
@@ -75,6 +77,10 @@ export class SerializationService implements ISerializationService {
 	) {
 	}
 
+	public isProviderRegistered(providerId: string): boolean {
+		return this.providers.find(provider => provider.providerId.toUpperCase() === providerId.toUpperCase()) !== undefined;
+	}
+
 	public registerProvider(providerId: string, provider: azdata.SerializationProvider): void {
 		this.providers.push({ providerId: providerId, provider: provider });
 	}

src/sql/workbench/contrib/notebook/browser/outputs/gridOutput.component.ts

@@ -487,10 +487,13 @@ export class DataResourceDataProvider implements IGridDataProvider {
 			let connProviders = this.cellModel.notebookModel.getApplicableConnectionProviderIds(this.cellModel.notebookModel.selectedKernelDisplayName);
 			if (connProviders?.length > 0) {
 				provider = connProviders[0];
-			} else {
-				provider = mssqlProviderName;
 			}
 		}
+		if (!provider || !this._serializationService.isProviderRegistered(provider)) {
+			// Serializing notebook query results to file is agnostic of database engine since the data is already available in the notebook.
+			// If the provider doesn't have its own serializer we can let the mssql provider handle it.
+			provider = mssqlProviderName;
+		}
 		let formatSpecificParams = serializer.getBasicSaveParameters(format);
 		let formatAgnosticParams = <Partial<SerializeDataParams>>{
 			serializationProviderId: provider,