style(xy): expose isolated point style

[markov00]

Summary

Fix part of #1902 by exposing the style of the isolated points.

Now the previously called orphan data points are renamed to isolated points to follow a more mathematical semantic.

Checklist

• The proper chart type label has been added (e.g. :xy, :partition)
• The proper feature labels have been added (e.g. :interactions, :axis)
• The :theme label has been added and the @elastic/eui-design team has been pinged when there are Theme API changes
• All related issues have been linked (i.e. closes #123, fixes #123)
• New public API exports have been added to packages/charts/src/index.ts
• Unit tests have been added or updated to match the most common scenarios
• The proper documentation and/or storybook story has been added or updated
• The code has been checked for cross-browser compatibility (Chrome, Firefox, Safari, Edge)
• Visual changes have been tested with all available themes including dark, light, eui-dark & eui-light

[markov00]

buildkite update screenshots

[nickofthyme]

Not sure if you were waiting on my review or not, but the changes look good to me.

[markov00]

Not sure if you were waiting on my review or not, but the changes look good to me.

Thanks, no I'm just waiting to test this in Kibana directly. I probably will consider exposing this configuration in the theme and tweaking this in Kibana rather than having this hardcoded

[nickofthyme]

Changes LGTM, tested locally and see no issues other than the one below. I left a few minor code comments in addition.

The point shapes story has a regression in the legend symbols.

[markov00]

Changes LGTM, tested locally and see no issues other than the one below. I left a few minor code comments in addition.

The point shapes story has a regression in the legend symbols.

Thank you @nickofthyme , this was actually a bug not previously discovered. It is fixed in 2199a2e

[markov00]

buildkite update screenshots

[nickofthyme]

Thanks, changes LGTM! 🚢