[dbt.artifacts] Remove dbt.core imports from dbt.artifacts

[MichelleArk]

Housekeeping

• I am a maintainer of dbt-core

Short description

In order to complete decoupling of dbt/artifacts from dbt/core, we need to remove any imports of dbt.core modules from dbt.artifacts.

Acceptance criteria

allow imports from dbt_common and dbt.artifacts in dbt.artifacts, but not other dbt.* modules

Suggested Tests

Tests associated to moved components should be defined in tests/unit/artifacts or tests/functional/artifacts.

Impact to Other Teams

N/A

Will backports be required?

nope

Context

No response