chore: remove nodeunit from the repo and support for it in cdk-build (aws#16596)

Now that all modules are in `jest`, remove `nodeunit` and
`@types/nodeunit` everywhere.

Finally, remove remove support for nodeunit in cdk-build.
This means that the special "jest" flag is no longer required
in the "cdk-build" section of `package.json`.

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: Niranjan Jayakar

package.json

@@ -29,9 +29,7 @@
     "standard-version": "^9.3.1",
     "typescript": "~3.9.10"
   },
-  "tap-mocha-reporter-resolutions-comment": "should be removed or reviewed when nodeunit dependency is dropped or adjusted",
   "resolutions": {
-    "tap-mocha-reporter": "^5.0.1",
     "string-width": "^4.2.2"
   },
   "repository": {

packages/@aws-cdk-containers/ecs-service-extensions/package.json

@@ -36,9 +36,6 @@
     "organization": true
   },
   "license": "Apache-2.0",
-  "cdk-build": {
-    "jest": true
-  },
   "devDependencies": {
     "@types/jest": "^26.0.24",
     "cdk-build-tools": "0.0.0",