Only reopen judge assign tasks if attorney tasks are cancelled

[hschallhorn]

Resolves bug where all attorney tasks would cancel their parent and open another JudgeAssignTask when cancelled

Acceptance Criteria

• ONLY AttorneyTasks cancel their parent and open another JudgeAssignTask when cancelled

Testing Plan

AttorneyQualityReviewTask

1. Sign in as QR_USER and return any ama task to a judge
2. Sign in as that judge and send that task back to the attorney
3. Cancel the task that was just created
4. Ensure the QR task is still in the judge's queue and an assign task has not been created

AttorneyDispatchReturnTask

1. Sign in as BVAGWHITE and return any ama task to a judge
2. Sign in as that judge and send that task back to the attorney
3. Cancel the task that was just created
4. Ensure the dispatch task is still in the judge's queue and an assign task has not been created

AttorneyRewriteTask

1. SIgn in as BVAAASHIRE and return any ama task to an attorney
2. Cancel the task that was just created
3. Ensure the decision review task is still in the judge's queue and an assign task has not been created

[codeclimate]

Code Climate has analyzed commit 13bdbac and detected 0 issues on this pull request.

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[va-bot]

1 Warning

⚠️

This PR adds one or more new specs. If the specs use the DB, see if you can rewrite them so they don’t use the DB, such as by using build_stubbed. If they must use the DB, please remember to add the appropriate require statements and either the :postgres or :all_dbs tags, as documented in our Wiki: https://github.com/department-of-veterans-affairs/caseflow/wiki/Testing-Best-Practices#tests-that-write-to-the-db

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[lomky]

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