Remount RelatedAreas when data changes

[envex]

What does this implement/fix?

Remount <RelatedAreas /> when the data changes.

Resolves https://github.com/Shopify/core-issues/issues/71032#issuecomment-2129763962

Storybook link

Before merging

• Check your changes on a variety of browsers and devices.

• Update the Changelog's Unreleased section with your changes.

• Update relevant documentation, tests, and Storybook.

• Make sure you're exporting any new shared Components, Types and Utilities from the top level index file of the package

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
polaris-viz-core-cjs	61.18 KB (0%)	1.3 s (0%)	848 ms (-2.47% 🔽)	2.1 s
polaris-viz-cjs	216.17 KB (-0.02% 🔽)	4.4 s (-0.02% 🔽)	1.8 s (+0.28% 🔺)	6.1 s
polaris-viz-esm	176.5 KB (+0.01% 🔺)	3.6 s (+0.01% 🔺)	1.5 s (+2.52% 🔺)	5 s
polaris-viz-css	4.79 KB (0%)	96 ms (0%)	246 ms (-20.39% 🔽)	342 ms
polaris-viz-esnext	182.42 KB (+0.01% 🔺)	3.7 s (+0.01% 🔺)	1.3 s (+1.53% 🔺)	5 s

[blboyle]

Looks good to me!