feat(textile): update number of references index thresholds.

[n1k0]

🔧 Problem

Notion card

Two problems:

1. We want the thresholds applied to clearly distinguish:
   • Ultra fast fashion which should be at 0%
   • Fast fashion which should be around 50%
2. We do not want the thresholds to:
   • Penalize brands that offer, for example, clothing for large sizes (this does not increase the choice offered to people who are not concerned)

🍰 Solution

Update thresholds; today the “largeur de gamme” index takes the following thresholds:

• 100% when the number of references is less than 3000
• 80% for 6,000 references
• 50% for 10,000 references
• 0% when the number of references is greater than 50,000

These should be replaced as following:

• 100% when the number of references is less than 1,000
• 80% for 6,000 references ⇒ this threshold is deleted
• 50% for 7,000 references
• 0% when the number of references is greater than 16,000

🏝️ How to test

Check that the computed non-physical durability index incorporates these changes adjusting the Nombre de références field value.

Note: unit tests have been updated, precise acceptance tests may eventually be added to the card as requested over mattermost.

[vjousse]

LGTM!