Change optimistic-types to false in Nashorn ScriptEngine initialization

It has been observed a strong performance degradation in the evaluation of Automation scripts between 10.10 and 2021.0 due to the change of JDK. The difference is with a factor 4.

By passing optimistic-types=false (instead true) in AutomationScriptingServiceImpl#
getScriptEngine, it diminishes the factor by 2, which seems to provide acceptable performances for end-users

Can this change be applied by default?

Note sure if this change should be forwarded after LTS 2021, based on the fact that the JDK17 has a different implementation of Nashorn, so LTS 2023 may not be affected.