fix: remove avatar attach offset in character controller

[aixaCode]

What does this PR change?

Removes 0.75 offset in the avatar attach component.

After this is merge, we can merge back those changes decentraland/sdk7-goerli-plaza#167
This is the expected result:

This can introduce breaking change for some scenes.
With current live version the test scene will be broken and look like that

How to test the changes?

1. Launch the explorer
2. /changerealm https://sdk-team-cdn.decentraland.org/ipfs/goerli-plaza-fix-protocol-squad-1-latest
3. Go to 75,-7
4. check that the switched avatar model is aligned properly on the ground

Our Code Review Standards

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

Copilot summary

copilot:summary

[github-actions]

After the CI passes:

Web

This branch can be previewed at:

• https://play.decentraland.org/?explorer-branch=fix/remove-avatar-attach-offset
• https://play.decentraland.zone/?explorer-branch=fix/remove-avatar-attach-offset

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 7

• Open SDK7 scenes playground
• Open SDK7 goerli plaza scenes
• Open SDK7 test scenes

SDK 6

• Open SDK6 scenes in preview

More

• Code coverage report: https://renderer-artifacts.decentraland.org/branch-coverage/fix/remove-avatar-attach-offset
• Benchmark report: https://renderer-artifacts.decentraland.org/branch-benchmark/fix/remove-avatar-attach-offset/index.html