Podcast: enqueue media library for cover image selector

[arcangelini]

Summary

This is to fix the broken image selector in Podcast.

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

No

Testing instructions:

1. Go to Jetpack ⇢ Podcast ⇢ Settings
2. Add a cover image for your feed
3. Image should get applied

[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 WoA dev 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 (Jetpack or WordPress.com Site Helper), and enable the arcangelini/podcast-fix-image-selector branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack arcangelini/podcast-fix-image-selector

bin/jetpack-downloader test jetpack-mu-wpcom-plugin arcangelini/podcast-fix-image-selector

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!

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[jp-launch-control]

Code Coverage Summary

This PR did not change code coverage!

That could be good or bad, depending on the situation. Everything covered before, and still is? Great! Nothing was covered before? Not so great. 🤷

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