BuildAcceleration: Incorrect files copied when DisableTransitiveProjectReferences is true

## Visual Studio Version
17.14.12

## Summary
When `DisableTransitiveProjectReferences` is enabled BuildAcceleration will copy more files to the output than a call to msbuild does.
Msbuild does **not** copy transitive dependencies that are not referenced statically in the dependency graph of the direct dependencies when `DisableTransitiveProjectReferences` is enabled . When build acceleration is enabled these files get copied anyways

## Steps to Reproduce

1. Clone my repo: https://github.com/janthomasQS/BuildAccelerationRepro
2. Build the solution with VS. the first build will consider all projects out of date and call msbuild for all of them
3. Observe the build output of `BuildAccelRepro.csproj` : `IndirectDependency.dll` does **not** exist in the output
4. Build another time in VS
5. VS will now copy `IndirectDependency.dll` into the output of `BuildAccelRepro.csproj`

## Expected Behavior
Build acceleration should copy the same files as a call to msbuild does.

## Actual Behavior
More files are copied.

## User Impact
Using BuildAcceleration changes the build output result and might therefore change behaviour.