Social Logos: Rewrite svg-optimize script in JS

[tbradsha]

As the title says, this rewrites said script in JS.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

Does this pull request change what data or activity we track or use?

Testing instructions:

Make sure ./tools/build continues to create optimized SVGs in ./build/svg-clean as before.

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WordPress.com Simple site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin, and enable the update/social-logos/do_svg_optimize_with_js branch.

  • For jetpack-mu-wpcom changes, also add define( 'JETPACK_MU_WPCOM_LOAD_VIA_BETA_PLUGIN', true ); to your wp-config.php file.

• To test on Simple, run the following command on your sandbox:

  bin/jetpack-downloader test jetpack update/social-logos/do_svg_optimize_with_js
  

  bin/jetpack-downloader test jetpack-mu-wpcom-plugin update/social-logos/do_svg_optimize_with_js
  

Interested in more tips and information?

• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[github-actions]

Thank you for your PR!

When contributing to Jetpack, we have a few suggestions that can help us test and review your patch:

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• 🔴 Add a "[Status]" label (In Progress, Needs Team Review, ...).
  
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[anomiex]

LGTM. The built artifacts are almost all the same, the only difference is addition of newlines at EOF in build/svg-clean/ which makes no difference to anything else.

Two suggestions inline, but feel free to ignore them if you want.