fix(icon): remove legacy ie overflow css causing ios clipping issues

[jawinn]

Description

It was reported that this normalize CSS for IE 9/10/11, which Spectrum Web Components converts to the selector :host(:not(:root)), was leading to "clipping on iOS mobile (for Express) as well as on Safari on MacOS". An Express-specific hotfix was already put in to override this overflow declaration.

This is safe to remove as the project does not support IE 11.

Reference:
The original necolas/normalize.css has this normalization labeled as "Correct overflow not hidden in IE 9/10/11."

CSS-700

How and where has this been tested?

Please tag yourself on the tests you've marked complete to confirm the tests have been run by someone other than the author.

Validation steps

@marissahuysentruyt

• Icon stories render correctly (recommendation: also check in Safari and Edge)
• There are no VRT changes

Regression testing

Validate:

1. The documentation pages for at least two other components are still loading, including:

• The pages render correctly, are accessible, and are responsive.

2. If components have been modified, VRTs have been run on this branch:

• VRTs have been run and looked at.
• Any VRT changes have been accepted (by reviewer and/or PR author), or there are no changes.

To-do list

• I have read the contribution guidelines.
• ✨ This pull request is ready to merge. ✨

[changeset-bot]

🦋 Changeset detected

Latest commit: 879f318

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@spectrum-css/icon	Patch

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[github-actions]

File metrics

Summary

Total size: 4.63 MB^*
Total change (Δ): ⬇ 0.30 KB (-0.01%)

Table reports on changes to a package's main file. Other changes can be found in the collapsed Details section below.

Package	Size	Δ
icon	11.33 KB	⬇ 0.08 KB

Details

icon

File	Head	Base	Δ
index-base.css	11.33 KB	11.41 KB	⬇ 0.08 KB (-0.67%)
index-vars.css	11.33 KB	11.41 KB	⬇ 0.08 KB (-0.67%)
index.css	11.33 KB	11.41 KB	⬇ 0.08 KB (-0.67%)
metadata.json	5.96 KB	6.02 KB	⬇ 0.06 KB (-1.02%)

* Size determined by adding together the size of the main file for all packages in the library.
* Results are not gzipped or minified.
* An ASCII character in UTF-8 is 8 bits or 1 byte.

[github-actions]

🚀 Deployed on https://pr-2974--spectrum-css.netlify.app

[marissahuysentruyt]

I checked both our prod open source icon storybook and the preview url in Chrome, Firefox, Safari and Edge on Mac, then Edge & Firefox on Windows via assistiv labs. I toggled the Express context and Large scale and didn't see any clipping on our end 👍

If I get all the way into the SWC storybook, I found examples of the Express icon clipping and saw the overflow: hidden code. I don't think this fix would be immediately visible via the preview link though (since it wouldn't be released yet for SWC to take in, right?), so I don't think I should be surprised that I still see the clipping. Hopefully this will improve it for them, and in turn Express!