Premium Analytics: update Locations selector size

[nerrad]

Fixes #

Proposed changes

• Add the WordPress Components 40px default size opt-in to the Premium Analytics Locations widget view selector.
• Add a Premium Analytics changelog entry.

Related product discussion/links

• None.

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

No.

Testing instructions

• In a Premium Analytics local environment, open the dashboard page that renders the Locations widget.
• Confirm the Locations widget's "View by" selector renders normally.
• Confirm the browser console no longer logs the wp.components.SelectControl 36px default size deprecation warning for the Locations selector.
• Run pnpm --filter @automattic/jetpack-premium-analytics typecheck.
• Run pnpm --filter @automattic/jetpack-premium-analytics build.
• Run pnpm --filter @automattic/jetpack-premium-analytics test.

[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. 🤷

Full summary · PHP report

[github-actions]

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