#13318344 Site Profiler: Add a blur effect for locked metrics

Fixes Automattic/dotcom-forge#6676

Proposed Changes

Add a blurry effect for locked metrics. The icon will also change to a locker.

Why are these changes being made?

The list of metrics should show blurred items when on teaser mode.

Testing Instructions

• Go to /site-profiler/:url. Ex: /site-profiler/example.com
• Scroll down and check if the metrics of the Health Scores section is blurred as the image above.

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• https://wpcalypso.wordpress.com/devdocs/docs/testing/index.md for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the “[Status] String Freeze” label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
• For changes affecting Jetpack: Have we added the “[Status] Needs Privacy Updates” label if this pull request changes what data or activity we track or use (p4TIVU-aUh-p2)?