Warn on non-SSR friendly code

[mxdvl]

What does this change?

Add a new ESLint rule to ensure our code is SSR friendly, but set its level to WARN

We can make it an ERROR once all 19 instances of non-isomorphic code are addressed.

Why?

Prevent regressions from happening after #8991

Enable the work in #9757

[github-actions]

Size Change: 0 B

Total Size: 730 kB

ℹ️ View Unchanged

Filename	Size
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dotcom-rendering/dist/FooterLabel-importable.web.********************.js	336 B
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[prout-bot]

Seen on PROD (merged by @mxdvl 10 minutes and 12 seconds ago) Please check your changes!