[release/10.0] [Blazor] Disable preloading for enhanced navigation

[github-actions]

Backport of #63544 to release/10.0

/cc @javiercn @maraf

[Blazor] Disable preloading for enhanced navigation

This PR disables generating preloading elements from ResourcePreloader when the HTTP request is for enhanced navigation.

Description

Enhanced navigation presents several challenges for preloading

• DOM merging: Preloading elements may be different between pages which may result in different order, resulting in removing and adding elements, resulting in browser triggering more preload requests than necessary.
• WebAssembly runtime state: When navigating between pages, WebAssembly is not restarting, only for the first page we need a preloading element.

This PR disables generating preloading elements from ResourcePreloader when the HTTP request is for enhanced navigation.
It alsore removes previous attempt to solve the DOM merging problem from #63239

Customer Impact

Customers won't get extra preload requests for resources that have already been loaded on previous page when doing enhanced navigation.

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

Verification

• Manual (required)
• Automated

[danmoseley]

@lewing do you want to take this one?