refactor(dbt): move scaffold to subdirectory

[rexledesma]

Summary & Motivation

Small refactor since we'll add a subdirectory here in this folder.

How I Tested These Changes

bk

[rexledesma]

Current dependencies on/for this PR:

• master
  • PR refactor(dbt): move scaffold to subdirectory #19545 👈
    • PR refactor(dbt): rename test_dagster_metadata to test_dagster_meta_config #19546
      • PR test(dbt): add jaffle shop project to test Dagster metadata #19547
        • PR feat(dbt): collect column metadata using the underlying dbt adapter #19712
        • PR feat(dbt): add dagster dbt package #19623
          • PR feat(dbt): collect columns metadata using the dagster dbt package #19631
            • PR docs(dbt): add reference for collecting columns metadata using the dagster dbt package #19628
        • PR feat(dbt): emit table schema metadata #19548
          • PR docs(dbt): add reference to enable emitting table schema metadata #19551

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