Snowflake Loader: fix loading path used with temp creds auth method

[spenes]

When temporary credentials method is enabled on Snowflake Loader, temporary table is used in the interim step while loading the data to events table.

In the interim step, events are loaded to temp table initially then they are copied from temp table to events table.

In here, loader is copying all the data in the given path. However, this is not correct. Loader needs to copy only successfully transformed data and this data reside on output=good sub folder. Therefore, we should add output=good to this path.