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.

Fixes #3078
Depends on #3107

[pycord-app]

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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

[ToothyDev]

Due to many attributes not being accessible or documented on the API and the nameplate being handled in #3107, this leaves just the avatar decoration data to trigger the event

[Paillat-dev]

This seems to work fine; code lgtm; yippie

fixed