fix: #3622100 Storing entity storage as a class property is not recommended

Ben Stallingsrequested to merge
issue/migrate_plus-3622100:3622100-storing-entity-storage into 6.0.x

Call EntityTypeManagerInterface::getStorage() at the call site in EntityValue::loadEntities() instead of caching it in a class property.

Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com

Closes #3622100

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