Update PATH to our xcopy CLI

In the case the CLI was previously downloaded but not yet on `%PATH%` we
need to manually add it there. Not doing it leads to cases where MSBuild
can't find the proper SDK and as a result failing the build.

closes #25649

build/scripts/build-utils.ps1

@@ -136,7 +136,6 @@ function Ensure-NuGet() {
 # Ensure the proper SDK in installed in our %PATH%. This is how MSBuild locates the 
 # SDK. Returns the location to the dotnet exe
 function Ensure-DotnetSdk() {
-
     # Check to see if the specified dotnet installations meets our build requirements
     function Test-DotnetDir([string]$dotnetDir, [string]$runtimeVersion, [string]$sdkVersion) {
         $sdkPath = Join-Path $dotnetDir "sdk\$sdkVersion"
@@ -180,6 +179,9 @@ function Ensure-DotnetSdk() {
         Exec-Block { & $destFile -Version $sdkVersion -InstallDir $cliDir } | Out-Null
         Exec-Block { & $destFile -Version $runtimeVersion -SharedRuntime -InstallDir $cliDir } | Out-Null
     }
+    else {
+        ${env:PATH} = "$cliDir;${env:PATH}"
+    }
 
     return (Join-Path $cliDir "dotnet.exe")
 }

build/scripts/build.ps1

@@ -180,7 +180,10 @@ function Restore-Packages() {
         Write-Host "Restoring $($both[0])"
         $projectFilePath = $both[1]
         $projectFileName = [IO.Path]::GetFileNameWithoutExtension($projectFilePath)
-        $logFilePath = Join-Path $logsDir "Restore-$($projectFileName).binlog"
+        $logFilePath = ""
+        if ($binaryLog) { 
+            $logFilePath = Join-Path $logsDir "Restore-$($projectFileName).binlog"
+        }
         Restore-Project $dotnet $both[1] $logFilePath
     }
 }