fix: confluent cloud service account creation exit code

Author: devshawn

src/main/java/com/devshawn/kafka/gitops/cli/AccountCommand.java

@@ -27,6 +27,7 @@ public Integer call() {
             ParserService parserService = new ParserService(parent.getFile());
             StateManager stateManager = new StateManager(generateStateManagerConfig(), parserService);
             stateManager.createServiceAccounts();
+            return 0;
         } catch (MissingConfigurationException | ConfluentCloudException ex) {
             LogUtil.printSimpleError(ex.getMessage());
         } catch (ValidationException ex) {