Upgrade desktop UI to Ember 4.12.2 (#1990)

* Upgrade desktop UI to Ember 4.12.2

* refactor: 💡 refactor scripts

Refactor concurrently scripts, and removed duplicate entries in
`eslintrc.js`

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-11747

* refactor: 💡 peer dependencies

Revert changes to `peerDependencies`.

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-11747

* refactor: 💡 revert config back before upgrade

Revert `styelint-standard-config-scss` back to 6.0.0 so that it can be
put into seperate ticket.

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-11747

* Update _notify.scss

fix misspelling

* refactor: 💡 revert dependency

Revert `stylelint-config-standard-scss` back to original version

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-11747

ui/admin/package.json

@@ -31,7 +31,7 @@
     "start": "ember serve",
     "clean:coverage": "rm -rf coverage_*",
     "pretest": "yarn clean:coverage",
-    "test": "concurrently \"npm:lint\" \"npm:test:*\" --names \"lint,test:\"",
+    "test": "concurrently \"npm:test:*\" --names \"test:\"",
     "test:ember": "COVERAGE=true ember exam --test-port 0 --split=4 --parallel=1 --random",
     "e2e": "yarn playwright test --config ./tests/e2e/playwright.config.js",
     "e2e:dev:chrome": "yarn run e2e --project=chromium --headed",