Remove Razor SDK dependency in StaticWebAssets SDK

[MackinnonBuck]

There are places where the StaticWebAssets SDK depends on targets defined in the Razor SDK: https://github.com/search?q=repo%3Adotnet%2Fsdk+AssignRazorComponentTargetPaths+lang%3Axml&type=code

Ideally, we would only want the dependency to exist in the other direction.

See dotnet/sdk#31359 for more discussion.

[MackinnonBuck]

See also: dotnet/sdk#31559 (comment)