Support global.json's rollForward latest* variants (#538)

* Rename toolcache directory instead of moving to tmp

This further enhances time savings seen in #213, down from a few minutes to seconds.

* Remove branch constraint on workflows used for testing

This means you are going to be notified of CI issues quicker, especially if you have to wait for a confirmation before running the workflows on your PR.

* Support global.json's rollForward latest* variants

* Remove e2e-test's dependency on Microsoft.NET.Test.Sdk

The newer versions are net8.0/net462+ only, making older .NET sdks more annoying to test

* Revert "Remove e2e-test's dependency on Microsoft.NET.Test.Sdk"

This reverts commit 14839a662649cdea79ccecc3a7ce9a91386185b4.

* Don't run unsupported versions in global.json tests

* Revert "Remove branch constraint on workflows used for testing"

This reverts commit d9dae35030614ced7b174b151463481173bfe2a3.

__tests__/clear-toolcache.ps1

@@ -6,8 +6,8 @@ $dotnetPaths = @{
 
 foreach ($srcPath in $dotnetPaths[$args[0]]) {
     if (Test-Path $srcPath) {
-        Write-Host "Move $srcPath path"
-        $dstPath = Join-Path ([IO.Path]::GetTempPath()) ([IO.Path]::GetRandomFileName())
+        $dstPath = "$srcPath-" + [IO.Path]::GetRandomFileName()
+        Write-Host "Moving $srcPath to $dstPath"
         Move-Item -Path $srcPath -Destination $dstPath
     }
 }