Check if git tag matches Python package tag before releasing

[tomasfarias]

The release pipeline is mostly automated. The only manual steps are:

• Bumping the pyproject.toml version using poetry version
• Bumping the airflow_dbt_python.__version__ manually.
• Tagging latest commit.
• Pushing changes + tag.

However, I sometimes slip up, and we should have checks in place to prevent malformed releases.

In particular, this issue proposes adding a step to the Tagged release GitHub Action to check that the git tag matches airflow_dbt_python.__version__.