Remove participant status from epic participants

What does this MR do and why?

This MR removes status field from epic participants query (we don't need it to render a page anyway and request for status is extremely slow, see #362944 (comment 1123386625))

Screenshots or screen recordings

No visual changes

How to set up and validate locally

  1. Open an epic
  2. Check that participants are rendered correctly and there are no errors in the console

MR acceptance checklist

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

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