ui: Use eslint vs ember-cli-lint, sass vs dart-sass (#9078)

These two dependency changes means that @hashicorp/pds-ember can be
installed and used without any build/dependency issues

ui/packages/consul-ui/ember-cli-build.js

@@ -65,7 +65,7 @@ module.exports = function(defaults) {
         },
       },
       sassOptions: {
-        implementation: require('dart-sass'),
+        implementation: require('sass'),
         sourceMapEmbed: sourcemaps,
       },
       autoprefixer: {

ui/packages/consul-ui/package.json

@@ -72,7 +72,6 @@
     "d3-scale-chromatic": "^2.0.0",
     "d3-selection": "^2.0.0",
     "d3-shape": "^2.0.0",
-    "dart-sass": "^1.25.0",
     "dayjs": "^1.9.3",
     "ember-auto-import": "^1.5.3",
     "ember-changeset-conditional-validations": "^0.6.0",
@@ -83,7 +82,6 @@
     "ember-cli-babel": "^7.17.2",
     "ember-cli-code-coverage": "^1.0.0-beta.4",
     "ember-cli-dependency-checker": "^3.2.0",
-    "ember-cli-eslint": "^5.1.0",
     "ember-cli-flash": "^1.6.3",
     "ember-cli-htmlbars": "^5.2.0",
     "ember-cli-inject-live-reload": "^2.0.2",
@@ -123,6 +121,7 @@
     "ember-test-selectors": "^4.0.0",
     "ember-tooltips": "^3.4.3",
     "ember-truth-helpers": "^2.0.0",
+    "eslint": "^7.12.1",
     "eslint-plugin-ember": "^7.7.2",
     "eslint-plugin-node": "^11.0.0",
     "flat": "^5.0.0",
@@ -134,10 +133,10 @@
     "loader.js": "^4.7.0",
     "mnemonist": "^0.38.0",
     "ngraph.graph": "^19.1.0",
-    "node-sass": "^4.9.3",
     "pretender": "^3.2.0",
     "prettier": "^1.10.2",
     "qunit-dom": "^1.0.0",
+    "sass": "^1.28.0",
     "tape": "^5.0.1",
     "text-encoding": "^0.7.0",
     "torii": "^0.10.1"