WIP: Issue templates UI
What does this MR do?
Implements the issue templates UI from #18656 (closed).
Are there points in the code the reviewer needs to double check?
What is the best way to merge this with !4981 (merged) so I can continue?
Why was this MR needed?
What are the relevant issue numbers?
Related to #18656 (closed).
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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CHANGELOG entry added -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the style guides -
Branch has no merge conflicts with master(if you do - rebase it please) -
Squashed related commits together