[FEATURE ember-no-double-extend] Remove feature flagging and cleanup. #15181
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FACTORY_FOR
symbol. This was created as a way to internally use the new.factoryFor
system, and not worry ifno-double-extend
feature was enabled or disabled.LOOKUP_FACTORY
symbol. This was added as a "backdoor" to usecontainer.lookupFactory
(and its double extend semantics) without triggering a deprecation.