fix(csp): skip sharedStorage when enumerating globalThis properties

[PierreBultez]

Problem

The CSP parser enumerates all globalThis properties to build a set of known
globals. Accessing window.sharedStorage triggers Chrome's deprecation warning:

[Deprecation] Shared Storage API is deprecated and will be removed in a future release.

This causes Lighthouse "Best Practices" score to drop from 100 to 81.

This is the same class of issue that was already fixed for styleMedia.

Solution

Add "sharedStorage" to the skip list in the globalThis enumeration loop,
alongside the already-skipped "styleMedia".

Testing

• Before: Chrome DevTools shows deprecation warning on any page using Alpine CSP
• After: No deprecation warning, Lighthouse Best Practices score returns to 100
• No functional impact: sharedStorage is not used by Alpine or typical web apps

Fixes #4788

[calebporzio]

good catch. thanks