if no selector on anchor, don't style in EuiText

[snide]

Summary

Fixes #1372

I think this will work the way we expect EuiText to operate. If it's a regular anchor, pass on styling, but if it has a class, then ignore and use whatever it has. The assumption is that if you have a class on an anchor, you know how you want it styled.

Checklist

- [ ] This was checked in mobile
- [ ] This was checked in IE11
- [ ] This was checked in dark mode
- [ ] Any props added have proper autodocs

• Documentation examples were added
• A changelog entry exists and is marked appropriately
  - [ ] This was checked for breaking changes and labeled appropriately
  - [ ] Jest tests were updated or added to match the most common scenarios
• This was checked against keyboard-only and screenreader scenarios
  - [ ] This required updates to Framer X components

[cjcenizal]

Nice solution! Works as expected.

[cchaos]

Thanks!