Enable AOT repository generation by default.

Original pull request: #5017
Closes #4983

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/repository/aot/AotMongoRepositoryPostProcessor.java

@@ -44,9 +44,7 @@ public class AotMongoRepositoryPostProcessor extends RepositoryRegistrationAotPr
 			lazyLoadingProxyAotProcessor.registerLazyLoadingProxyIfNeeded(type, generationContext);
 		});
 
-		boolean enabled = Boolean.parseBoolean(
-				repositoryContext.getEnvironment().getProperty(AotContext.GENERATED_REPOSITORIES_ENABLED, "false"));
-		if (!enabled) {
+		if (!repositoryContext.isGeneratedRepositoriesEnabled("mongodb")) {
 			return null;
 		}