Escape path so that paths with spaces work (#18136)

Co-authored-by: John Wostenberg <jwosty@users.noreply.github.com>

Author: jwosty

eng/build-utils.ps1

@@ -243,7 +243,7 @@ function Make-BootstrapBuild() {
 
     # prepare compiler
     $projectpath = "$RepoRoot" + "proto.proj"
-    $args = "publish $projectpath -c $bootstrapConfiguration"
+    $args = "publish `"$projectpath`" -c $bootstrapConfiguration"
     if ($binaryLog) {
         $logFilePath = Join-Path $LogDir "bootstrap.binlog"
         $args += " /bl:`"$logFilePath`""