Add summarize_new_merge_request tool

What does this MR do and why?

Related to: #524924 (closed)

In this MR:

  • Add summarize_new_merge_request tool
  • Add summarize_new_merge_request to the FLAGGED_FEATURES
  • Adjust specs and feature metadata

Screenshots or screen recordings

Screen_Recording_2025-03-28_at_09.19.44

Merge request reports

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