GH-3132: Remove usage of super();

Fixes https://github.com/spring-projects/spring-integration/issues/3132

It turns out that Checkstyle EmptyBlock doesn't complain about
empty default ctor.
Plus a new check for `super();` call treats it as a violation

* Remove `super();` from all the no-arg ctors
* Code style clean up in the affected classes according
IDEA suggestions

* Fix new Sonar smells

spring-integration-scripting/src/main/java/org/springframework/integration/scripting/jsr223/ScriptExecutorFactory.java

@@ -65,7 +65,6 @@ public final class ScriptExecutorFactory {
 	}
 
 	private ScriptExecutorFactory() {
-		super();
 	}
 
 }