Add TaskDecorator support for scheduled tasks

[mhalbritter]

Spring Framework has added TaskDecorator support in spring-projects/spring-framework#23755.

Right now, we auto-configure TaskDecorator for task execution, but not for task scheduling. I think we should also support TaskDecorator beans for task scheduling.

[nosan]

@mhalbritter
Feel free to assign it to me

[snicoll]

Closing in favor of PR #43190