Show tasks in dashboard issue list

What does this MR do and why?

Make the types that we show in the dashboard issue list consistent with the project / group issue list.

How to set up and validate locally

  1. Create a Task and assign to yourself
  2. Click on the assigned issues icon in the top bar
  3. Check that the Task shows up

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #373210 (closed)

Merge request reports

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