fix: moved to product onboarding references about knowledge panels

[monsieurtanuki]

Deleted file:

• sample_knowledge_panels.json: now part of sample_product_data.json

Impacted files:

• knowledge_panel_page_template.dart: now using full product instead of just knowledge panels
• onboarding_data_product.dart: removed knowledge panels references as they're part of product now
• onboarding_loader.dartremoved knowledge panels references
• sample_product_data.json: refreshed data including knowledge panels

What

• From feat: knowledgePanels are now loaded with the other product fields #1691 we consider knowledge panels as a default field of products.
• That simplifies hugely the download of knowledge panels - it's now transparently done from product data download.
• That's also the case for the onboarding, where we previously accessed the back-end twice, once for product, once for knowledge panels.
• This PR is about downloading product and knowledge panels data in just one shot.

[codecov-commenter]

Codecov Report

Merging #1710 (16a95f9) into develop (2ea0da3) will decrease coverage by 0.56%.
The diff coverage is 0.68%.

@@            Coverage Diff             @@
##           develop   #1710      +/-   ##
==========================================
- Coverage     8.86%   8.30%   -0.57%     
==========================================
  Files          161     165       +4     
  Lines         6623    7119     +496     
==========================================
+ Hits           587     591       +4     
- Misses        6036    6528     +492     

Impacted Files	Coverage Δ
...h_app/lib/cards/category_cards/abstract_cache.dart	0.00% <0.00%> (ø)
...p/lib/cards/category_cards/asset_cache_helper.dart	0.00% <0.00%> (ø)
...p/lib/cards/category_cards/raster_async_asset.dart	0.00% <0.00%> (ø)
...oth_app/lib/cards/category_cards/raster_cache.dart	0.00% <0.00%> (ø)
..._app/lib/cards/category_cards/svg_async_asset.dart	0.00% <0.00%> (ø)
...smooth_app/lib/cards/category_cards/svg_cache.dart	0.00% <0.00%> (ø)
...t_cards/knowledge_panels/knowledge_panel_card.dart	0.00% <0.00%> (ø)
...t_cards/knowledge_panels/knowledge_panel_page.dart	0.00% <0.00%> (ø)
...s/knowledge_panels/knowledge_panel_table_card.dart	0.00% <0.00%> (ø)
...pp/lib/cards/product_cards/product_title_card.dart	0.00% <0.00%> (ø)
... and 46 more

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[M123-dev]

LGTM