A better list for sub-tasks to hide them from the main list

[BlueSky-fur]

Currently, when creating sub-task/s for issues they all share the same board view

I've created a test-issue to show this better

It would definetley be better practice to at least have a toggle of some sorts so that only the
"core" issue Installation of eu70198-shop is shown, maybe with an indicator that there exist sub-tasks.

And then when you click on the issue the normal sub-task list is fine.

Mainly requesting this because we already have this button, to show attached sub-tasks

It would definitely make it less cluttered, and give it a better general over-view.