[charts] Remove usage of focus outline for item highlight

[alexfauquette]

Fix #19754

While looking at having a similar DX to all series type, I noticed the line charts is the only one needing a component outside of the plot component.

For other series, the focus highlight can be done in PieArcPlot, BarPlot, Scatter, and BatchScatter

In this PR the bar charts have the 2 solution implemented to let you see the different options.

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Arguments about keeping the focus highlight inside existing component:

• Pros:
  • Avoid having component computation at multiple places
  • Make sure user will not forget it
• Cons:
  • Need to introduce inconsistencies between line chart and other charts
  • Devs have a more difficult access to those component (not sure it's a big deal)

Argument in favor of a dedicated component: we could reuse it with visibility: hidden to anchor the tooltip to some node.

[mui-bot]

Deploy preview: https://deploy-preview-19856--material-ui-x.netlify.app/

Updated pages:

• docs/data/charts/accessibility/accessibility.md

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