[EuiIcon] Add magnifyWithExclamation icon

[elizabetdev]

Summary

This PR adds a magnifyWithExclamation glyph to EuiIcon and closes #5274.

Design

• The icon uses an exclamation mark similar to the alert icon. Initially, it was using the same, but it was not looking good on non-retina displays and for this reason, it was enhanced.
• Following the alert icon the exclamation mark is centered in the circle.

Dark and light themes

Checklist

• Check against all themes for compatibility in both light and dark modes
• [ ] Checked in mobile
• Checked in Chrome, Safari, Edge, and Firefox
• [ ] Props have proper autodocs and **[playground toggles](https://github.com/elastic/eui/blob/main/wiki/documentation-guidelines.md#adding-playground-toggles)**
• [ ] Added documentation
• [ ] Checked Code Sandbox works for any docs examples
• Added or updated jest and cypress tests
• [ ] Checked for breaking changes and labeled appropriately
• [ ] Checked for accessibility including keyboard-only and screenreader modes
• A changelog entry exists and is marked appropriately

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_5455/

[cchaos]

Is there any way to align that exclamation portion a bit better to the pixel grid? It's quite blurry on non-retina:

Maybe use the same one from alert?

[elizabetdev]

I'm actually using the same exclamation portion from alert as mentioned in the description:

It's using the same exclamation mark as the alert icon.

Maybe it looks better in the alert icon because of the position. Let's see what I can do to make it less blurry on non-retina. 🤔

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_5455/

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_5455/

[elizabetdev]

@cchaos I improved the design and the exclamation mark is no longer 100% similar to the one in alert. I had to do small changes to make it look better on non-retina displays.

Non-retina displays

I tested in Safari and Firefox (low resolution) and these are the results comparing with the previous version:

Retina displays

On retina displays I think the exclamation mark now looks better:

[cchaos]

💯 Looks much crisper!

Looks like you need to update the snapshot again.

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_5455/