Add rake task to seed issues for the issue-to-mr eval

What does this MR do and why?

Adds a new rake task to create relevant issues under the test project gitlab-duo/test to be used by the issue-to-mr eval in CEF.

References

• SWE bench setup for issue to MR flow (gitlab-org/duo-workflow/testing/duo-workflow-tests#62)

How to set up and validate locally

1. Run the rake task:

bundle exec rake gitlab:duo:dap_evals_seeder

MR acceptance checklist

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