document-export: Parse the AddNamed reply for --noexist

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With --noexist, the opened file descriptor refers to the parent directory.
The request correctly uses AddNamed, but is_directory makes the reply
parser expect AddFull's array reply instead of AddNamed's single string.
This produces a GVariant type mismatch and crashes the command.

Only select the AddFull reply parser for directory exports without
--noexist, matching the method used for the request.

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500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f