fix(cli): clean failed tht installer staging

scripts/install-tht.ps1

@@ -122,6 +122,7 @@ try {
     if ($LASTEXITCODE -ne 0) { throw 'native artifact did not pass its help check' }
     Replace-InstalledBinary $stagedBinary (Join-Path $installDirectory 'tht.exe')
 } finally {
+    Remove-Item -LiteralPath $stagedBinary -Force -ErrorAction SilentlyContinue
     if ($buildOutput) { Remove-Item -LiteralPath $buildOutput -Recurse -Force -ErrorAction SilentlyContinue }
 }
 

scripts/test-install-tht.ps1

@@ -63,6 +63,8 @@ public static class ProgramOne {
     }
     if (-not $brokenInstallFailed) { throw 'installer accepted an invalid staged executable' }
     if ((& $installed version) -ne 'tht test version one') { throw 'invalid staged executable replaced the existing command' }
+    $stagingResidue = @(Get-ChildItem -LiteralPath $installDirectory -Filter '.tht-*.exe' -File)
+    if ($stagingResidue.Count -ne 0) { throw 'invalid staged executable left temporary installer files behind' }
 
     $env:THT_BUILD_ARTIFACT = $artifactTwo
     $env:THT_BUILD_ARTIFACT_SHA256 = (Get-FileHash -Algorithm SHA256 -LiteralPath $artifactTwo).Hash.ToLowerInvariant()