migrate from mocha to node:test (#479)

Author: aeschli

.mocharc.json

@@ -5,17 +5,12 @@
       "name": "Unit Tests",
       "type": "node",
       "request": "launch",
-      "program": "${workspaceRoot}/node_modules/mocha/bin/_mocha",
-      "stopOnEntry": false,
-      "args": [
-        "--timeout",
-        "999999",
-        "--colors"
+      "runtimeArgs": [
+        "--enable-source-maps",
+        "--test",
+        "lib/umd/test/**/*.test.js"
       ],
       "cwd": "${workspaceRoot}",
-      "runtimeExecutable": null,
-      "runtimeArgs": [],
-      "env": {},
       "sourceMaps": true,
       "outFiles": [
         "${workspaceRoot}/lib/umd/**"