[Board] Adding wip limits warning for grouped board

What does this MR do and why?

This MR adding warning about WIP limits to boards when it's grouped by epic. Because, currently when board is not grouped warning is showing and after grouping is not. Describe in detail what your merge request does and why.

Screenshots or screen recordings

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How to set up and validate locally

  1. You need to have an Enterprise Version of gitlab.
  2. Go to any project issues board.
  3. Set up WIP limit for some board.
  4. Add more issues to this board than set limits.
  5. Group board by epic.

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 #339519 (closed)

Merge request reports

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