[BUGFIX] Language mode for child object / findByUid query

This patch makes all child object queries and the findByUid query
in Extbase ignore the current language mode which prevents invalid
child object references.

Releases: 6.3, 6.2
Resolves: #59971
Change-Id: I0f9e0de9b118fbd3bc49d7b5960285a2a8dce8c8