These must be duplicated as we require the same files for both `build`
and `publish`. This is the requirement of the new schema, as `content`
was split.
Note that while each key can take an object, if given just a `string[]`
as we do here, it defaults to `include`.
See the new schema: https://github.com/aspnet/Announcements/issues/175
The powershell project's `Main` function initializes the custom
`AssemblyLoadContext` and then delegates to `UnmanagedPSEntry.Start`.
This lets us undo several changes to the `ConsoleHost` managed
entry (notably, the `Start` function signature does not have to change,
thus the `consoleFilePath` variable still exists).
The `src/powershell` project builds Core PowerShell as a .NET CLI app,
with a dependency on `Microsoft.PowerShell.ConsoleHost`, so that the
latter can remain a library.