[Static web assets] Unskip test

[javiercn]

• Removes test for [StaticWebAssets] Validate that no two assets end up in the same final path instead of checking they all have the same content root aspnetcore#24257 as its obsolete. This requirement was relaxed, so the test doesn't make sense.
• The test for this was reenabled and is passing Razor source generator: Determine viability of RazorCompileOnPublish aspnetcore#28781
• The test for this was reenabled and is passing https://github.com/dotnet/sdk/issues/28429

[ghost]

Thanks for your PR, @javiercn.
To learn about the PR process and branching schedule of this repo, please take a look at the SDK PR Guide.

[marcpopMSFT]

@javiercn FYI, we moved tests in this repo into a root Test folder in preparation for the installer merge in (and to be more consistent with standard recommendations). Keep and eye out and sync to a newer branch when making test updates. Yanni is in the process of resolving this here: #38305