[charts] The skeleton used when loading feels off

[oliviertassinari]

Steps to reproduce 🕹

Steps:

1. Open https://tools-public.mui.com/prod/pages/9r8fshsf

Current behavior 😯

A big grey flash.

Screen.Recording.2023-09-01.at.00.39.36.mov

https://mui.com/material-ui/react-skeleton/ wasn't designed to be used with large surface area.

Expected behavior 🤔

No response

Context 🔦

mui/mui-x#10194

Your environment 🌎

v0.1.24

[apedroferreira]

Ok, I thought it could still look fine and more consistent with a Skeleton after having discussed #2400 (comment) but you're right.
Let's revert back to a spinner.

[Janpot]

let's move the image component to a spinner as well then?

[apedroferreira]

let's move the image component to a spinner as well then?

There have been no complaints about the image and images load a bit differently, so maybe it's fine to keep the skeleton for them?