fix: Performance improvements for triggering emotes

[Kinerius]

What does this PR change?

• Fixed an issue that caused other avatars to trigger emotes to the current player
• Restored emote loop replication functionality
• Reduced allocations caused when AvatarModel changes, which is produced after any emote being triggered:

Before:

After:

The remaining 380 B comes from an intended data copy which its intent is not documented.

How to test the changes?

• Check that looping emotes are still working when spawning near a player that already triggered that emote
• Check that triggering an emote is visible in other clients
• Check that avatar pointer events work correctly (hover and click)
• Check that avatars are updated correctly after changing a wearable
• ⚠️ IMPORTANT ⚠️ Make sure you, other guests, or users using THIS branch, do not see yourselves doing random emotes, all other users that are not using this branch may be seen using some weird emotes making them float.

Our Code Review Standards

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

Copilot summary

🤖[deprecated] Generated by Copilot at 8fa6e9c

The pull request improves the avatar system by adding and using a baseAvatarReferences component that stores the base avatar data, and by simplifying and optimizing the code for the avatar anchors, expressions, and emotes. It also removes unused or redundant code and parameters, and follows the coding style conventions. The changes affect several files, such as AvatarShape.cs, AvatarAnchorPoints.cs, AvatarAnimatorLegacy.cs, and AvatarSceneEmoteHandler.cs, as well as the AvatarShape.prefab asset and the AvatarSceneEmoteHandlerShould.cs test file.

[github-actions]

After the CI passes:

Web

This branch can be previewed at:

• https://play.decentraland.org/?explorer-branch=fix/emotes-performance
• https://play.decentraland.zone/?explorer-branch=fix/emotes-performance

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/fix/emotes-performance
• Benchmark report: https://renderer-artifacts.decentraland.org/branch-benchmark/fix/emotes-performance/index.html

[anicalbano]

The PR has been reviewed by QA and it's working as expected! 😄

30.11.2023_09.38.45_REC.mp4

30.11.2023_09.30.43_REC.mp4

[pravusjif]

let's merge it!