nullable pragmas cannot be used in .razor / .cshtml files

[pranavkm]

Razor's codegen produces a bunch of #nullable restore for compiler generated code. Unfortunately, this pragma restores the nullability context to the project's settings and not what was last state for that file:

#nullable restore: Restores the nullable annotation context and nullable warning context to the project settings.

This makes it impossible for a user to suppress nullability warnings on a per-file basis using pragmas inside a code-block.

I suspect we could remove the generated #nullable pragmas now that the runtime is correctly annotated for nullability.

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