Make createBackendPlugin and createBackendModule return BackendFeature instead of () => BackendFeature

Signed-off-by: Fredrik Adelöw <freben@gmail.com>

plugins/devtools-backend/api-report.md

@@ -3,7 +3,7 @@
 > Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).
 
 ```ts
-import { BackendFeature } from '@backstage/backend-plugin-api';
+import { BackendFeatureCompat } from '@backstage/backend-plugin-api';
 import { Config } from '@backstage/config';
 import { ConfigInfo } from '@backstage/plugin-devtools-common';
 import { DevToolsInfo } from '@backstage/plugin-devtools-common';
@@ -29,7 +29,7 @@ export class DevToolsBackendApi {
 }
 
 // @public
-const devtoolsPlugin: () => BackendFeature;
+const devtoolsPlugin: BackendFeatureCompat;
 export default devtoolsPlugin;
 
 // @public (undocumented)