Rk/4648 runtime icon

[ryankeairns]

Closes #4648

Summary

1. Adds runtime icon.
2. Updates eql (picked up via yarn compile-icons)

---

1. indexRuntime

Template alignment

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2. eql

Not intentional change here. The yarn compile-icons step picked up some changes on the eql glyph, so they're included here. It initially messed up a path, so I copied the SVG element from the current, live docs site.

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
• Added documentation
  - [ ] Checked Code Sandbox works for the any docs examples
• Added or updated jest 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_4650/

[ryankeairns]

Here's a side-by-side view with an alternative design - no circle, just the play/triangle:

200%

100% (actual)

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_4650/

[cchaos]

I honestly find the one on the left (no circle) to be much more discernable than the other.

[ryankeairns]

I honestly find the one on the left (no circle) to be much more discernable than the other.

Same. I'll make the change!

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_4650/

[cchaos]

👍 LGTM!