[CT-2160] [Regression] "Legacy" Logging Broken in 1.4.2rc1

[peterallenwebb]

Is this a regression in a recent version of dbt-core?

• I believe this is a regression in dbt-core functionality
• I have searched the existing issues, and I could not find an existing issue for this regression

Current Behavior

When running a dbt command from the cli with the DBT_USE_LEGACY_LOGGER env var set, the console logs are written via a standard Python logger, rather than the logbook logger, as they should be to support legacy logging scenarios correctly.

Expected/Previous Behavior

Logging should be directed to the logbook log with this flags set, just as it was in 1.4.1.

Steps To Reproduce

Issue was seen when running dbt build with DBT_USE_LEGACY_LOGGER=True on the jaffle_shop project with 1.4.2rc1 on macOS with Python 3.10, but likely affects all platforms, Python versions, and projects.

Relevant log output

At the console, logs look the same, but integrations relying on logbook are failing.

Environment

- OS: macOS
- Python: 3.10
- dbt (working version): 1.4.1
- dbt (regression version): 1.4.2rc1

Which database adapter are you using with dbt?

postgres

Additional Context

No response

[jtcohen6]

Resolved by #7029