Destination snowflake: reorder auth spec options

[Edward Gao (edgao)]

https://airbytehq-team.slack.com/archives/C03C4AVJWG4/p1707781669791419?thread_ts=1707774340.370569&cid=C03C4AVJWG4

confirmed locally that the config now defaults to private key, and user/pass is second in the list

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