feat: exotic rarity

[lorux0]

What does this PR change?

Adds a new nft rarity called Exotic. Affects wearables and emotes.

How to test the changes?

1. Launch the explorer
2. Open the backpack
3. Check that your exotic wearables are displayed with a distinctive color
4. Check that all your wearables are displayed as expected
5. Go to the emotes tab
6. Check that your exotic emotes are displayed with a distinctive color
7. Check that your emotes are displayed as expected
8. Go to the world and open the emote wheel
9. Check that the exotic emotes are displayed with a distinctive color

Our Code Review Standards

https://github.com/decentraland/unity-renderer/blob/master/docs/code-review-standards.md

Copilot summary

copilot:summary

[github-actions[bot]]

After the CI passes:

Web

This branch can be previewed at:

• https://play.decentraland.org/?explorer-branch=feat/exotic-rarity
• https://play.decentraland.zone/?explorer-branch=feat/exotic-rarity

Desktop:

If you have the launcher installed (download launcher) you can press open on the following link:

• Open custom protocol
• Open custom protocol with Developer Mode

SDK 6/7:

• Open SDK7 scenes playground
• Open SDK7 scenes in preview
• Open SDK6 scenes in preview

More

• Code coverage report: https://renderer-artifacts.decentraland.org/branch-coverage/feat/exotic-rarity
• Benchmark report: https://renderer-artifacts.decentraland.org/branch-benchmark/feat/exotic-rarity/index.html

[Ludmilafantaniella]

The changes have been applied to the Unique category and Exotic on the user profile modal in Explorer, but they aren't the final design. The backpack and emote wheel looks good.