Fix 3rd party symbol archival

Author: AArnott

tools/Get-SymbolFiles.ps1

@@ -64,7 +64,3 @@ $PDBs |% {
         Write-Output $_.FullName
     }
 }
-
-if (!$Tests) {
-    & $PSScriptRoot\Get-3rdPartySymbolFiles.ps1
-}

tools/artifacts/symbols.ps1

@@ -1,7 +1,10 @@
 $BinPath = [System.IO.Path]::GetFullPath("$PSScriptRoot/../../bin")
+$3rdPartyPath = [System.IO.Path]::GetFullPath("$PSScriptRoot/../../obj/SymbolsPackages")
 if (!(Test-Path $BinPath)) { return }
 $symbolfiles = & "$PSScriptRoot/../Get-SymbolFiles.ps1" -Path $BinPath | Get-Unique
+$3rdPartyFiles = & "$PSScriptRoot/../Get-3rdPartySymbolFiles.ps1"
 
 @{
     "$BinPath" = $SymbolFiles;
+    "$3rdPartyPath" = $3rdPartyFiles;
 }