fix: 🐛 Complete user update methods

[ToothyDev]

Summary

Not all user object updates triggered the on_user_update_event, see the exact attributes which were missing in #3078
Also fixes an issue where User.nameplate is broken and inaccessible

Information

• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed).
• This PR is not a code change (e.g. documentation, README, typehinting,
  examples, ...).

Checklist

• I have searched the open pull requests for duplicates.
• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why.
• I have updated the changelog to include these changes.

Closes #3078
Depends on #3107

[pycord-app]

Thanks for opening this pull request!
Please make sure you have read the Contributing Guidelines and Code of Conduct.

This pull request can be checked-out with:

git fetch origin pull/3103/head:pr-3103
git checkout pr-3103

This pull request can be installed with:

pip install git+https://github.com/Pycord-Development/pycord@refs/pull/3103/head

[Paillat-dev]

[ToothyDev]

I think I added all possible ones here for now. The missing ones are described in #3078 (comment) with a reason. accent_color might be doable as well but I wasn't sure because it would introduce potentially blocking // time-delaying code otherwise sync code.

Also, I tested all cases I could think of for now, but please do test as well in case I forgot about any

[Dorukyum]

Suggested change

	- Fixed updates of the following `User` attributes not triggering the `on_user_update`
	event: `User.nameplate`.
	([#3103](https://github.com/Pycord-Development/pycord/pull/3103))
	- Fixed `User.nameplate` attribute not being accessible.
	([#3103](https://github.com/Pycord-Development/pycord/pull/3103))
	- Fixed `User.nameplate` not being accessible and its update not triggering the `user_update` event.
	([#3103](https://github.com/Pycord-Development/pycord/pull/3103))

[ToothyDev]

I forgot to include the avatar decoration data thing in the changelog so I left it at the old structure now, but updated

[ToothyDev]

Currently paused / drafted as User.collectibles will be implemented before this