Fix airflowctl failed-deps test fixture missing required fields

[justinpakzad]

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#69397 was merged recently but its TestFailedDeps helper builds a TaskInstanceResponse without the required nullable fields. This causes the airflowctl unit tests to fail (see here). This PR passes those required fields to fix the failures.

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[henry3260]

Thanks for the fix!

[github-actions]

Backport failed to create: airflow-ctl/v0-1-test. View the failure log Run details

Note: As of Merging PRs targeted for Airflow 3.X
the committer who merges the PR is responsible for backporting the PRs that are bug fixes (generally speaking) to the maintenance branches.

In matter of doubt please ask in #release-management Slack channel.

Status	Branch	Result
❌	airflow-ctl/v0-1-test

You can attempt to backport this manually by running:

cherry_picker 9248978 airflow-ctl/v0-1-test

This should apply the commit to the airflow-ctl/v0-1-test branch and leave the commit in conflict state marking
the files that need manual conflict resolution.

After you have resolved the conflicts, you can continue the backport process by running:

cherry_picker --continue

If you don't have cherry-picker installed, see the installation guide.