message: e2e tests: Massively speed up format check
  * e2e tests: Massively speed up format check
  It now need 7.5 instead of 187 seconds
  * Set git user
diff: @@ -20,17 +20,12 @@ $testProjects | % {
  Write-Trace "test re-serializing every manifest"
  $manifestDir = "$TestingRoot/manifest-dir"
  -New-Item -Path $manifestDir -ItemType Directory | Out-Null
  -
  -$ports = Get-ChildItem "$env:VCPKG_ROOT/ports"
  -
  -$ports | % {
  - Copy-Item "$_/vcpkg.json" "$manifestDir" | Out-Null
  - $x = Get-Content "$manifestDir/vcpkg.json" -Raw
  - Run-Vcpkg -EndToEndTestSilent format-manifest "$manifestDir/vcpkg.json" | Out-Null
  - Throw-IfFailed "$_/vcpkg.json"
  - $y = Get-Content "$manifestDir/vcpkg.json" -Raw
  - if ($x -ne $y) {
  - throw "Expected formatting manifest $_/vcpkg.json to cause no modifications"
  - }
  +Copy-Item -Path "$env:VCPKG_ROOT/ports" -Destination $manifestDir -recurse -Force -Filter vcpkg.json
  +& git init $manifestDir && git -C $manifestDir add . && git -C $manifestDir -c user.name='vcpkg-test' -c user.email='my@example.com' commit -m "baseline"
  +Throw-IfFailed
  +Run-Vcpkg format-manifest --all --x-builtin-ports-root=$manifestDir/ports
  +Throw-IfFailed
  +$diff = (& git -C $manifestDir diff) | Out-String
  +if ($diff.length -gt 0) {
  + throw "Expected formatting of manifests vcpkg.json to cause no modifications: \n$diff"
  }
  