plugins: refactory to use default export for new backend system

Co-authored-by: Fredrik Adelöw <freben@gmail.com>
Co-authored-by: Camila Belo <camilaibs@gmail.com>
Co-authored-by: Johan Haals <johan.haals@gmail.com>
Co-authored-by: Philipp Hugenroth <philipph@spotify.com>
Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/adr-backend/api-report.md

@@ -45,7 +45,8 @@ export type AdrParserContext = {
 };
 
 // @public
-export const adrPlugin: () => BackendFeature;
+const adrPlugin: () => BackendFeature;
+export default adrPlugin;
 
 // @public (undocumented)
 export type AdrRouterOptions = {

plugins/adr-backend/src/index.ts

@@ -22,4 +22,4 @@
 
 export * from './search';
 export * from './service';
-export { adrPlugin } from './plugin';
+export { adrPlugin as default } from './plugin';