Install sxs with the install-dotnet scripts (#124)

* Use dotnet-install scripts for proper sxs

* Update dotnet version in testing

* Error message cleanup

* SxS testing in the dotnet project

* Update package lock

* Test fixes

* Use proper environment variable

* Set dotnet root for windows

package.json

@@ -35,7 +35,6 @@
     "@actions/github": "^1.1.0",
     "@actions/http-client": "^1.0.8",
     "@actions/io": "^1.0.2",
-    "@actions/tool-cache": "^1.3.1",
     "fast-xml-parser": "^3.15.1",
     "semver": "^6.3.0",
     "xmlbuilder": "^13.0.2"
@@ -52,5 +51,8 @@
     "ts-jest": "^26.0.0",
     "typescript": "^3.9.3",
     "wget-improved": "^3.2.1"
+  },
+  "jest": {
+    "testEnvironment": "node"
   }
 }