Fix saga first chapter zcc

[ssk97]

This is a cleaned version of #11619.

This makes it so that if a permanent is entering as the ability's zcc is being updated, then the zcc is the permanent's instead of the spell's. An ability that happens "as ~ enters" will not have a changed zcc, as it isn't put into the entering list until after those abilities have been processed. The new SigardasSplendorTest verifies this behavior.

This also centralizes the updating of ability zcc, though addDelayedTriggeredAbility is unchanged due to to d8959f1. The only logic change is in the getPermanentEntering check.

Fixes #11728

[JayDi85]

@xenohedron @Susucre do not merge until I finish the research (soon)

[Susucre]

@JayDi85 have you gotten the time to review this?
It's been on alpha for 2 weeks, and no bug was noticed with it (commander, sealed and cube games occured)

[JayDi85]

Yes, looks like it related to wrong usage of Ability::getSourceObjectZoneChangeCounter() and exile zone id (see details in #13737) -- I need to check it.