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* Snowflake Variant Type should not prevent downloads or attachments

Fixes #46981

The :type/SnowflakeVariant key matches 2 methods in `metabase.query-processor.streaming.common/global-type-settings`.

In this case, it seems that the variant type can be any type, so we shouldn't try to guess anything here, except if
the user has provided a :semantic_type, which we can use.

Otherwise, we'll keep going without formatting details about the variant column, which is likely fine already, as it
should result in strings in the export/attachments.

* add a test