Issue #3583389: Move path prefix disambiguation from DomainNegotiator to DomainStorage

Frank Mablyrequested to merge
issue/domain-3583389:3583389-move-path-prefix into 3.x

Moves negotiateByPathPrefix() from DomainNegotiator to DomainStorage::loadByHostnameAndCurrentPath() and replaces DomainNegotiatorInterface dependency in DomainAliasHooks with DomainNegotiationContext.

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