Simplify PublicTopLevelProgramGenerator

[Youssef1313]

Simplify PublicTopLevelProgramGenerator

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Summary of the changes (Less than 80 chars)

Simplifies the generator

Description

There is no need to have multiple transformations in the generator.

Fixes #{bug number} (in this specific format)

[dotnet-policy-service]

Hey @dotnet/aspnet-build, looks like this PR is something you want to take a look at.

[captainsafia]

Thanks for opening this PR, @Youssef1313! It looks like there's some build errors that need to be resolved.

BTW, I recognize that multiple transformations aren't necessarily needed, but is there a harm to having them? Also in this case, I figured there might be some value to having some transformations (like the resolution of the syntax nodes) as the last stage in case other transformations fail.