fix for stopping dags in terminal state

[patkivikram]

Description

Fix to not call stop for DAG's in terminal states Fixes https://github.com/wayfair-incubator/dagger/issues/51

Type of Change

• [ ] Bug Fix
• [ ] New Feature
• [ ] Breaking Change
• [ ] Refactor
• [ ] Documentation
• [ ] Other (please describe)

Checklist

• [ ] I have read the contributing guidelines
• [ ] Existing issues have been referenced (where applicable)
• [ ] I have verified this change is not present in other open pull requests
• [ ] Functionality is documented
• [ ] All code style checks pass
• [ ] New code contribution is covered by automated tests
• [ ] All new and existing tests pass

[codecov[bot]]

Codecov Report

Merging #52 (5844c11) into main (35a0b1e) will not change coverage. The diff coverage is n/a.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #52 +/- ## ======================================= Coverage 86.51% 86.51% ======================================= Files 12 12 Lines 1824 1824 Branches 215 215 ======================================= Hits 1578 1578 Misses 146 146 Partials 100 100 ``` | [Files](https://app.codecov.io/gh/wayfair-incubator/dagger/pull/52?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wayfair-incubator) | Coverage Δ | | |---|---|---| | [dagger/tasks/task.py](https://app.codecov.io/gh/wayfair-incubator/dagger/pull/52?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wayfair-incubator#diff-ZGFnZ2VyL3Rhc2tzL3Rhc2sucHk=) | `79.37% <ø> (ø)` | |