Need to use --no-write-json to avoid empty STG_DBT__NODE_EXECUTIONS model

[sfc-gh-dflippo]

Hello, recently I was tracking down why many of my models were empty and I tracked it down to the command I was using to invoke the new upload macro:
dbt run-operation upload_dbt_artifacts_v2

I found that my manifest.json was being replaced by the macro's execution and that was causing the STG_DBT__NODE_EXECUTIONS model to have zero rows because it has an inner join between stg_dbt__artifacts and stg_dbt__nodes. In my case the issue was resolved by using this command to upload instead:
dbt --no-write-json run-operation upload_dbt_artifacts_v2

I recommend the README.md be updated to include the --no-write-json parameter.

I also recommend committing the fix for issue #64 because that was also one of my root causes.

[NiallRees]

Thanks for finding this @danflippo !