BigQuery build plan requires CREATE SCHEMA permissions to create external tables

[thomas-vl]

Describe the bug

Before trying to create a new dataset we should check if it already exists without using the CREATE statement.
It could be that the DBT SA or DBT user that runs the command does not has the permission to create a dataset.

[thomas-vl]

PR:
#220

[MaselEOBHH]

Fixed in Version 0.8.7.

Hopefully you do not have digits in your google-project-name :-)
See #235

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