feat(PauseableImage): A11y make markdown images pausable

[vonbarown]

Overview

PR Checklist

• Related to designs:
• Related to JIRA ticket: A11Y-612
• 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

Don't make me tap the sign.

PR Links and Envs

Repository	PR Link	PR Env
Monolith	Monolith PR	Monolith Env
Portal	Portal Link	Portal Env
Ent LE	Ent LE	Ent LE
LE	LE	LE

Testing

1. Visit https://661ff21efb58595e58424448--gamut-preview.netlify.app/?path=/docs/organisms-markdown--image-overrides
2. Ensure that the image renders and you can pause the GIF

[codecademydev]

📬Published Alpha Packages:

@codecademy/gamut@55.17.5-alpha.fa497e.0
@codecademy/gamut-kit@0.6.402-alpha.fa497e.0
@codecademy/styleguide@66.17.6-alpha.fa497e.0

[codecademydev]

🚀 Styleguide deploy preview ready!

https://6626b74365330c2496fed529--gamut-preview.netlify.app

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