ci: 💚 Remove extra linting CI workflow

When the pre-commit workflow was added in ros-controls#473,
the GitHub workflow specified in lint.yml became obsolete
as all linting in now done through pre-commit in format.yml.
With the exception of three packages,
all linting packages have an exact match:
1.ament_pep257 -> pypi pep257
2. ament_flake8 -> pypi flake8
3. ament_xmllint -> pre-commit xml linting

Fixes Duplicate CI Linting jobs ros-controls#479