Patch - CSS code optimization and minification - Replace Node Sass wi…

…th Dart Sass (#2457)

* Build: Update WET and disable version check task

Specifically:
* Package: Temporarily replaced WET dependency (github:wet-boew/wet-boew#v4.0.83) with wet-boew/wet-boew#9840's branch
* Gruntfile: Temporarily disabled "check-wet-version" task (to avoid a version mismatch)

* Build: Replace Node Sass with Dart Sass

Replaces GCWeb's direct Sass dependencies (i.e. not from its WET dependency):
* Package: Replace node-sass with sass (aka Dart Sass)
* Gruntfile: Update sass variable's requirement from "node-sass" to "sass"

* Revert "Build: Update WET and disable version check task"

This reverts commit b20b569.

Gruntfile.coffee

@@ -1,6 +1,6 @@
 #global module:false
 path = require("path")
-sass = require("node-sass")
+sass = require("sass")
 yaml = require("js-yaml")
 
 module.exports = (grunt) ->