Modify macros to directly work with yaml metadata

[tkirschke]

Description

Please include a summary of the changes and the related issue and context.

Fixes #181

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce.

• New models in dbt-automatic-tests have been executed

Complete https://github.com/ScalefreeCOM/datavault4dbt-automatic-tests/pull/187 before starting the pipeline for this PR.

[remoteworkflow]

Link to workflow summary: https://github.com/ScalefreeCOM/datavault4dbt-ci-cd/actions/runs/12650686153

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RESULTS for Synapse:
❌ dbt-tests
✅ dbt-macro-tests

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RESULTS for Postgres:
✅ dbt-tests
✅ dbt-macro-tests

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RESULTS for BigQuery:
❌ dbt-tests
✅ dbt-macro-tests

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RESULTS for Redshift:
✅ dbt-tests
✅ dbt-macro-tests

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RESULTS for Snowflake:
❌ dbt-tests
✅ dbt-macro-tests

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RESULTS for Exasol:
❌ dbt-tests
✅ dbt-macro-tests

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RESULTS for Fabric:
✅ dbt-tests
✅ dbt-macro-tests

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RESULTS for Oracle:
❌ dbt-tests
✅ dbt-macro-tests

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RESULTS for Databricks:
✅ dbt-tests
✅ dbt-macro-tests

[tkiehn]

Is contained in the test-branch now

[tkiehn]

Closed in favor of #300