feat: Finalize Eco-Score knowledge panels

[stephanegigandet]

This PR contains a version of the Eco-Score knowledge panel (and sub panels), that we can use to remplace the existing "Ecoscore details" dropdown.

Included changes:

• Knowledge panels API change to make it possible to display small icons (useful for the Eco-Score subpanels)
• Attributes API: added the grade in addition to the score (this is to avoid clients guessing if match 20 is D or E)
• Some shortening of panels titles
• Colors for panel titles if the panel has a specified grade (useful for Eco-Score, Nutri-Score etc.)
• Lighter colors for panels titles backgrounds
• Bigger padding for panel content so that it's easier to see the nesting of subpanels, and which subpanel is inside which panel.
• Use panel groups inside the Eco-Score panel for the agribalyse LCA, adjustments, and total score

To test: add ?panels=1
e.g. https://uk.openfoodfacts.dev/product/00434034/swiss-chocolate-extra-fine-milk-marks-spencer?panels=1

Example 1:

Example 2:

Example 3:

The goal is to soon replace the current Eco-Score details:

[alexgarel]

Seems ok, although I'm not able to test it (no eco-score data, dont have the time to upload new data now).

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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