[illink] refactor code sharing between ILLink and MSBuild tasks #9688
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We already have a few trimmer steps that run under both ILLink and the
<LinkAssembliesNoShrink/>
MSBuild task:AddKeepAlivesStep
FixAbstractMethodsStep
FixLegacyResourceDesignerStep
We want to move various parts of the build to become new trimmer steps like above.
Previously, we also had to share these steps with the Xamarin.Android linker pipeline, but that's no longer the case. We can now cleanup how these trimmer steps are shared between ILLink and MSBuild, reducing the need for
#if ILLINK
in many places.I also removed various Mono linker source code that is unused.