Use targeted database for BigQuery profile

[jbandoro]

Fixes #102, the diffs in this PR are from the pre-commit black formatter, when it was actually only a single line update. I tested and it works as expected, though not sure if we want to default to the service-account project if db_name is None.

[chrishronek]

@jbandoro wanted to confirm this value would be the equivalent of a GCP project_id, but your change will make it configurable, correct?

[jbandoro]

@jbandoro wanted to confirm this value would be the equivalent of a GCP project_id, but your change will make it configurable, correct?

yes that's correct. ATM the target GCP project_id is that of the GCP service account, and this PR will allow the project_id (dbt database) to be specified in dbt_args, for the case where a service account has access to many GCP projects.

[chrishronek]

@jbandoro cool, I think it makes sense to defer a project_id (or database) from the service account when the db_name isn't specified, which is why I added that last commit. Thank you for this contribution; it makes a lot of sense and is much appreciated! I will have @jlaneve take a look before we approve, just so that my commit is also getting reviewed. Once we get his 👍 then we can merge!

[jlaneve]

nice, this change looks good! eventually as the connection logic continues to grow we may want to find a better/cleaner way to define this, but I think this is good for now