Fork task_list gem

What does this MR do?

Replace the unmaintained task_list gem with the deckar01-task_list fork

Are there points in the code the reviewer needs to double check?

• I had to pin some dependencies in the fork to support ruby < 2.2, which added new version restrictions for 2 existing modules.
• I triggered a build after I removed the patch to show the test passed with the new gem, then I removed the test, because this behavior is tested in the gem's repo now.

Why was this MR needed?

• The task_list patch was added with a comment that said it should be removed when merged upstream, but the repo got archived, so an upstream patch requires a fork.
• #22470 (closed) can't be patched without warnings due to the way task_list uses Ruby constants.
• There are additional outstanding task_list bugs that can be fixed once we switch to a fork.

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

• #22466 (closed)
• #22470 (closed)
• !6487 (merged)