Fixes: https://github.com/dotnet/source-build/issues/4344https://github.com/dotnet/runtime/pull/100595 introduced two issues:
- Lower MSBuild version dependency - 17.8.3, instead of 17.8.5. This caused transitive package downgrade errors.
- Source-build dependency for MSBuild, in runtime repo. This caused downgrade of MSBuild repo in VMR, from 17.8.5 to 17.8.3.
Besides removing direct package references, the fix is to add a direct MSBuild source-build dependency in `installer` repo.
I'm also adding the missing MSBuild dependencies to runtime, for proper PVP flow. Without the explicit dependencies, my validation build was hitting an issue with `Microsoft.Build.Framework` package downgrade in
`src/tasks/Microsoft.NET.Sdk.WebAssembly.Pack.Tasks/Microsoft.NET.Sdk.WebAssembly.Pack.Tasks.csproj`:
```
/vmr/src/runtime/artifacts/source-build/self/src/src/tasks/Microsoft.NET.Sdk.WebAssembly.Pack.Tasks/Microsoft.NET.Sdk.WebAssembly.Pack.Tasks.csproj : error NU1605: Warning As Error: Detected package downgrade: Microsoft.Build.Framework from 17.8.5 to 17.8.3. Reference the package directly from the project to select a different version. [/vmr/src/runtime/artifacts/source-build/self/src/Build.proj]
/vmr/src/runtime/artifacts/source-build/self/src/src/tasks/Microsoft.NET.Sdk.WebAssembly.Pack.Tasks/Microsoft.NET.Sdk.WebAssembly.Pack.Tasks.csproj : error NU1605: Microsoft.NET.Sdk.WebAssembly.Pack.Tasks -> Microsoft.Build 17.8.5 -> Microsoft.Build.Framework (>= 17.8.5) [/vmr/src/runtime/artifacts/source-build/self/src/Build.proj]
/vmr/src/runtime/artifacts/source-build/self/src/src/tasks/Microsoft.NET.Sdk.WebAssembly.Pack.Tasks/Microsoft.NET.Sdk.WebAssembly.Pack.Tasks.csproj : error NU1605: Microsoft.NET.Sdk.WebAssembly.Pack.Tasks -> Microsoft.Build.Framework (>= 17.8.3) [/vmr/src/runtime/artifacts/source-build/self/src/Build.proj]
```
Fully validated with an internal pipeline run: https://dev.azure.com/dnceng/internal/_build/results?buildId=2436369&view=results
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