title	issue	author	author_email	author_github
Fix extension column export	NEXT-14993	Malte Janz	m.janz@shopware.com	Malte Janz

Core

Changed EntitySerializer to also serialize entity extension fields
Changed CriteriaBuilder to also include extensions as associations if they are used in the mapping
Changed KeyMappingPipe to point to the right path if the field is part of an entity extension

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