Kusto - ADS Core changes (#11750)

* ADS Core changes

* Generic fix to get language mode based on providerId

* Addressed comments

* Fix failing tests

* Fix for "New Notebook" from file menu option

* Remove line

* Fix for merge conflict

* Add removed comment back

* Addressed comments

Co-authored-by: Monica Gupta <mogupt@microsoft.com>

src/sql/workbench/services/connection/browser/connectionManagementService.ts

@@ -1431,6 +1431,13 @@ export class ConnectionManagementService extends Disposable implements IConnecti
 		return connectionProvider && connectionProvider.properties;
 	}
 
+	/**
+	 * Gets languageMode property of provider if it exists. Defaults to 'sql'
+	*/
+	public getProviderLanguageMode(providerName?: string): string {
+		return this._providers.get(providerName)?.properties?.['languageMode'] || 'sql';
+	}
+
 	/**
 	 * Get known connection profiles including active connections, recent connections and saved connections.
 	 * @param activeConnectionsOnly Indicates whether only get the active connections, default value is false.