[JavaPlayFramework] Add parameters for beanValidation in the application.conf + fix bugs (#6794)

* Add configuration to split input and output bean validations. When useBeanValidation is used, the variable are created in the application.conf file and can be tweaked by environment. For example, dev and stage can have true to both but only have input in prod.

* Refactor of mustache tags for more clarity

* sample generation with refactor

* Fix a couple of bugs with the fake-endpoint yaml but there is still 2 cases where it doesn't work.

samples/server/petstore/java-play-framework-no-bean-validation/app/swagger/SwaggerUtils.java

@@ -9,6 +9,7 @@ import java.lang.annotation.Target;
 import java.text.SimpleDateFormat;
 import java.util.*;
 
+
 public class SwaggerUtils {
 
     @With(ApiCall.class)
@@ -17,6 +18,7 @@ public class SwaggerUtils {
     public @interface ApiAction {
     }
 
+
     public static List<String> parametersToList(String collectionFormat, String[] values){
         List<String> params = new ArrayList<>();