fix: Lacto-ovo-vegetarian taxonomy

[Freso]

Currently the lacto- and ovo-vegetarian labels both derive from lacto-ovo-vegetarian, which will almost always be wrong. Ovo-vegetarians consume eggs but not dairy, while lacto-vegetarians consume dairy but not eggs—ovo-lacto-vegetarians consume both dairy and eggs.

This makes the en:Ovo-lacto-vegetarian labels instead be a parent of en:Lacto-vegetarian and en:Ovo-vegetarian instead, since anything that is either lacto- or oco-vegetarian will also be ovo-lacto-vegetarian. en:Ovo-lacto-vegetarian is additionally made a child of en:Vegetarian since the ovo/lacto modifier adds additional restrictions, so vegetarians who still consume non-human animal byproducts (like dairy and eggs) will be fine with this.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.29%. Comparing base (e8deee5) to head (aab7d08).
Report is 142 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11852      +/-   ##
==========================================
+ Coverage   49.88%   50.29%   +0.40%     
==========================================
  Files          83       84       +1     
  Lines       22984    23119     +135     
  Branches     5508     5532      +24     
==========================================
+ Hits        11466    11628     +162     
+ Misses      10121    10072      -49     
- Partials     1397     1419      +22     

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[stephanegigandet]

I'm not too sure about the "Contains milk" label. It's not really a label, if we want to find products that contain milk, then using the ingredients en:milk tag is the way to go.

[Freso]

@stephanegigandet Is it possible to have incompatible_with:en: ingredients:en:dairy and match that against labels with ingredients:en: en:dairy (ideally as well as children of ingredients:en:dairy)? This PR was split out of my vegan label tightening, where I’ve also marked en: Contains milk as a child of en: Non-vegan, which will, in turn, cause all of the milk labels to get marked as not vegan due to the label override code, even if they have no ingredients listed or all (non-vegan) ingredients are unknown. I could mark all the milk labels with < en:Non-vegan directly, but this felt like a better approach.

(I also realise that this would all be better once we store derived and actually entered items separately, but I’m not sure how far off in the future that is, ie., whether to wait for this to manifest.)

[Freso]

I took out the < en:Contains milk bits for now, to not hold up the rest of this longer than necessary.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[stephanegigandet]

Thank you