Added docs for quota project

[jcarpenter12]

What are you changing in this pull request and why?

References dbt-labs/dbt-bigquery#1343 dbt-labs/dbt-bigquery#1344

Adding docs to detail changes in PR dbt-labs/dbt-bigquery#1345

This adds detail about how to override the quota_project through the dbt profile. It also updates the information regarding the execution project. I believe that the execution project just sets where the BQ job is created and doesn't actually impact where it's billed from (I could be wrong on this, but from my testing I can see that the quota project is set from the environment not from the execution project override currently detailed in the docs).

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[jcarpenter12]

Please see the two issues referenced in the details for context on this

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[matthewshaver]

Thank you @jcarpenter12 !

[matthewshaver]

Putting on hold in draft. Can merge when dbt-labs/dbt-bigquery#1345 is complete

[jcarpenter12]

Putting on hold in draft. Can merge when dbt-labs/dbt-bigquery#1345 is complete

Thanks @matthewshaver for taking a look at this, much appreciated!