✨ Update JSInterop details to use direct code evaluation

[peterblazejewicz]

As mentioned in the comment in the protectedBrowserStorage.js (being
removed), that is now possible to access some native features of the
JavaScript engine without a need of the custom wrapper:

// We may be able to eliminate this .js file entirely as of preview 8,
// because it will be possible to invoke things like localStorage.setValue
// directly from .NET without needing a JS wrapper

This change
removes such access wrapper and simplifies implemenation, which results
in cleaner, quicker to grasp code.

• implemenation detail changes
• removed JavaScript code
• tests updates
• no JavaScript (Blazor only)
  Thanks!