fix(cdk/portal): fix incorrect injector hierarchy with DomPortalOutlet and child environment injectors #30610
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This commit fixes a regression that was introduced in #27427, where the injector hierarchy
did not respect nested environment injectors.
DomPortalOutlet
was always using the applicationroot as environment injector, yet the element injector may have a custom child environment injector
as ancestor. This child environment injector has to be retrieved manually and passed as environment
injector of the portal component.
Fixes #30609