Add pre-model hook for cleaning up remote temporary table on MotherDuck #375
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When a dbt incremental model is run on MotherDuck, the otherwise temporary table is created as a regular table on the server in a
dbt_tempschema, and the table is dropped afterwards (see #326). However, if something goes wrong with the dbt run, the table persists. This PR adds thedrop_relationcall to the pre-model hook such that the "temporary" table is dropped beforehand if it still exists.