Removing unused using formats/changes other parts of the document

[davkean]

1. Remove unused usings from the following:

Imports System

Module Module1

Sub Main()

End Sub

End Module

using System;

namespace ConsoleApplication68
{
class Program
{
}
}

Expected:

Module Module1

Sub Main()

End Sub

End Module

namespace ConsoleApplication68
{
class Program
{
}
}

Actual:

Module Module1

    Sub Main()

    End Sub

End Module

namespace ConsoleApplication68
{
    class Program
{
}
}

Make note, while in a single file this might seem that bad - when applying this across a significant project, the Preview window shows very strange diffs like below that caused me not to trust it as it's not obvious what's changing:

[CyrusNajmabadi]

Would take a small PR here. Remove unused usings should not touch anything but usings and only whitespace directly around them.

[CyrusNajmabadi]

Fixed with #76038.