Adding a Transform to a project using adapter-specific dbt installation re-adds legacy dbt Transformer

[MeltyBot]

Migrated from GitLab: https://gitlab.com/meltano/meltano/-/issues/3382

Originally created by @kgpayne on 2022-04-06 12:20:40

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When adding a Transform plugin to a Meltano Project that already has an adapter-specific Transformer installed (e.g. dbt-snowflake), the legacy dbt transformer (and associated file bundle) are also installed, causing duplicate files in the transform/ directory.

[MeltyBot]

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