feat(Icon): Add AlertFilledIcon

[katiezutter]

Overview

Adds AlertFilledIcon.

PR Checklist

• Related to designs: Weekly Syllabus
• Related to JIRA ticket: LEGO-4255
• I have run this code to verify it works
• This PR includes unit tests for the code change
• This PR includes testing instructions tests for the code change
• The alpha package of this PR is passing end-to-end tests in all relevant Codecademy repositories

Testing Instructions

Follow the testing instructions in https://github.com/codecademy-engineering/mono/pull/8863.

PR Links and Envs

Repository	PR Link	PR Env
Portal	Portal Link	Portal Env

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[codecademydev]

🚀 Styleguide deploy preview ready!

https://6761bdd586ccd105bd1fc554--gamut-preview.netlify.app

Deploy Logs

[codecademydev]

📬Published Alpha Packages:

@codecademy/[email protected]
@codecademy/[email protected]
@codecademy/[email protected]

[katiezutter]

@Codecademy/gamut hi! I'm not seeing the new icon show up in the storybook preview - wondering if there may be a step I'm missing!

[LinKCoding]

Checked locally and the icon looks good in both light + dark mode —
at the moment, seems like the preview isn't reflecting the code changes for some reason (also saw this in another PR)

since it works locally and the alpha package works in the monorepo PR, will approve.