title	issue	author	author_email
Core fixes	NEXT-33707	oskroblin Skroblin	o.skroblin@shopware.com

Core

Changed ProductNoLongerAvailableEvent behavior, event will only be triggered when the state changed and not always when the available flag got written
Changed messenger.routing.senders config, to be merge correct when in the project custom routings are defined
Changed MigrationStep::updateDestructive visibility from abstract to none-abstract
Removed all ADD COLUMN ... AFTER statements in migrations, which cause performance issues
Changed Es\CriteriaParser::parseSorting to support nested sorting
Added AbstractElasticsearchDefinition::getIterator, which allows to create an own iterator for the definition instead of a generic

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