Parity Fixes with Test Runner (QOL Changes) (#607)

* Fix missed directory change that isn't used anymore

* Fixes, improvements, and cleanup while reconciling test runner scripts

* Additional cleanup

* Fix possible hang

* Don't mislead with activation server on windows

* Update node version

src/model/docker.ts

@@ -21,6 +21,9 @@ class Docker {
         break;
       case 'win32':
         runCommand = this.getWindowsCommand(image, parameters);
+        break;
+      default:
+        throw new Error(`Operation system, ${process.platform}, is not supported yet.`);
     }
 
     options.silent = silent;

src/model/image-tag.ts

@@ -169,7 +169,7 @@ class ImageTag {
 
     if (customImage) return customImage;
 
-    return `${image}:${tag}`; // '0' here represents the docker repo version
+    return `${image}:${tag}`;
   }
 }