Unlike anchor tenants, these domains can be registered for any number of years,
but only during GA, as third parties cannot register domains pre-GA except
through the anchor tenant program.
Since this is new functionality, unlike creation of anchor tenants, there is no
fallback provided to send codes through the domain authcode; they must be sent
using the allocation token extension.
And note that, like with anchor tenants, providing the domain-specific
allocation token overrides any other reserved types that might apply to that
domain.
No changes are necessary to the domain application create flow because of the
above restriction to GA.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=212310701
1b3df82fb3