[14.0][ADD] mgmtsystem_review_copy_lines

[deeniiz]

Summary

• Duplicating a management system review now also duplicates its review lines
  (title, type, linked action/nonconformity and decision), so a review can be
  kept as a template and duplicated instead of re-entering its structure.
• Every duplicate starts in the Open state, even when the source review is
  closed — avoiding copies born closed and read-only.
• Reference assignment is unchanged: each copy still gets a fresh sequence reference.

Test plan

• pre-commit passes locally (black, isort, flake8, pylint_odoo, oca-gen-addon-readme)
• CI green
• Manual test (UI / Playwright, dev DB): duplicating a template copies all
  lines with decision + linked action, fresh reference, disjoint line ids;
  duplicating a closed review yields an open, editable copy
• Unit tests executed in runtime (pending: dev role lacks CREATEDB; covered by CI)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.31%. Comparing base (e066126) to head (92da6c1).

Additional details and impacted files

@@            Coverage Diff             @@
##             14.0     #931      +/-   ##
==========================================
+ Coverage   51.26%   51.31%   +0.05%     
==========================================
  Files        1180     1185       +5     
  Lines       20388    20420      +32     
  Branches     4298     4301       +3     
==========================================
+ Hits        10451    10479      +28     
- Misses       9683     9686       +3     
- Partials      254      255       +1     

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