Remove the duplicated scheduleFn initialization in GitHubEntityProvider

Signed-off-by: Mengnan Gong <namco1992@gmail.com>

.changeset/yellow-tips-exist.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-catalog-backend-module-github': patch
+---
+
+Remove the duplicated `scheduleFn` initialization in `GitHubEntityProvider`.

plugins/catalog-backend-module-github/src/providers/GitHubEntityProvider.ts

@@ -98,7 +98,6 @@ export class GitHubEntityProvider implements EntityProvider {
     this.scheduleFn = this.createScheduleFn(schedule);
     this.githubCredentialsProvider =
       SingleInstanceGithubCredentialsProvider.create(integration.config);
-    this.scheduleFn = this.createScheduleFn(schedule);
   }
 
   /** {@inheritdoc @backstage/plugin-catalog-backend#EntityProvider.getProviderName} */