Annotate RAR SearchPaths added because they're "next to a reference"

[rainersigwald]

If you have an assembly in a folder next to an explicitly referenced-by-path assembly, and also have a transitive or direct-by-name reference to it, it can be found next to the explicitly referenced-by-path assembly. But the logging only indicates that it was found "for SearchPath", which is confusing because that folder wasn't in RAR's input SearchPath.

For example, build this project from a Developer Command Prompt:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net472</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <Reference Include="$(DevEnvDir)\..\..\MSBuild\Current\Bin\Microsoft.Build.dll" />
    <Reference Include="Microsoft.Build.Framework, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
  </ItemGroup>

</Project>

That produces this RAR snippet for Framework:

Primary reference "Microsoft.Build.Framework, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a". (TaskId:59)
    Resolved file path is "C:\Program Files\Microsoft Visual Studio\2022\Preview\MSBuild\Current\Bin\Microsoft.Build.Framework.dll". (TaskId:59)
    Reference found at search path location "C:\Program Files\Microsoft Visual Studio\2022\Preview\MSBuild\Current\Bin". (TaskId:59)
        For SearchPath "C:\Program Files\Microsoft Visual Studio\2022\Preview\MSBuild\Current\Bin". (TaskId:59)
        Considered "C:\Program Files\Microsoft Visual Studio\2022\Preview\MSBuild\Current\Bin\Microsoft.Build.Framework.winmd", but it didn't exist. (TaskId:59)

If the problem you're troubleshooting is "why did this file get resolved here?" there's a lot of confusion looking at that. If it could say something like

-        For SearchPath "C:\Program Files\Microsoft Visual Studio\2022\Preview\MSBuild\Current\Bin". (TaskId:59)
+        For SearchPath "C:\Program Files\Microsoft Visual Studio\2022\Preview\MSBuild\Current\Bin" (added by referencing assembly "Microsoft.Build, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"). (TaskId:59)

it might be clearer (but any improvement would be good).