Fix missing and inconsistent reporting of type hint issues and messages

* Fix #11686
* Fix #11687
* Reduce duplicate code related to param type hint validation of stubbed/non-stubbed code (related to #11687)
* Fix #11688
* Fix #11689
* Fix #11690
* remove legacy template expansion code in built-in template handling and use newly existing param flag to handle it (no change in functionality)

Author: kkmuffme