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.

src/setup-dotnet.ts

@@ -207,9 +207,27 @@ function getVersionFromGlobalJson(globalJsonPath: string): string {
   if (globalJson.sdk && globalJson.sdk.version) {
     version = globalJson.sdk.version;
     const rollForward = globalJson.sdk.rollForward;
-    if (rollForward && rollForward === 'latestFeature') {
-      const [major, minor] = version.split('.');
-      version = `${major}.${minor}`;
+    if (rollForward) {
+      const [major, minor, featurePatch] = version.split('.');
+      const feature = featurePatch.substring(0, 1);
+
+      switch (rollForward) {
+        case 'latestMajor':
+          version = '';
+          break;
+
+        case 'latestMinor':
+          version = `${major}`;
+          break;
+
+        case 'latestFeature':
+          version = `${major}.${minor}`;
+          break;
+
+        case 'latestPatch':
+          version = `${major}.${minor}.${feature}xx`;
+          break;
+      }
     }
   }
   return version;