Updated tasks on boards to be behind user title

What does this MR do and why?

Per #461855 (comment 2241949053), we're putting tasks on boards behind the use_work_items_view user preference toggle.

References

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Related to #461855 (comment 2241949053)

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Screenshots or screen recordings

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Before After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

  1. Enable the :work_items_view_preference feature flag to show the toggle.
  2. Visit any issue page, and turn on the "New Issue Look" toggle.
  3. Visit a project or group board with tasks. Notice, those tasks should be visible in the board now.

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