[SR] Pause router marquee when scrolled out of view

[robert-bogos]

Added logic to pause the router marquee autoplay when it is scrolled out of view. It resumes when scrolled back into view.
This also frees up resources for a small performance bump while scrolling through the page.

Test URLs:

• Before: https://main--upp--adobecom.aem.page/homepage/drafts/ramuntea/redesign-demo?martech=off
• After: https://main--upp--adobecom.aem.page/homepage/drafts/ramuntea/redesign-demo?milolibs=rm-pause-play&martech=off

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Commits

• 1f995e7 ✅ (latest)

[rgclayton]

Nit. I'm noticing that if I've scrolled the router-marquee out of view and resize the page to a different viewport that autoplaying of router-marquee starts back up, even though it's not in view.