chore: switch to eslint-plugin-drupal-contrib

eslint-config-drupal has some pain points (mostly due to React support
which we don't need) and no updates since Fall 2020.

Other notable changes:
- Bring over the .prettierrc.json from core
- Use ignores rather than only linting js/ckeditor5_plugins

References: #3458367

.eslintignore

+js/build

.eslintrc.json

 {
-  "extends": [
-    "drupal"
-  ],
+  "extends": ["plugin:drupal-contrib/passing"],
   "root": true
 }

.prettierignore

+**/config/**/*.yml

.prettierrc.json

+{
+  "printWidth": 80,
+  "semi": true,
+  "singleQuote": true,
+  "trailingComma": "all",
+  "overrides": [
+    {
+      "files": ["*.css"],
+      "options": {
+        "parser": "css",
+        "printWidth": 10000,
+        "singleQuote": false
+      }
+    }
+  ]
+}

package.json

@@ -7,8 +7,8 @@
   "scripts": {
     "watch": "webpack --mode development --watch",
     "build": "webpack",
-    "lint": "eslint js/ckeditor5_plugins/**/*.js",
-    "fix": "prettier --write js/ckeditor5_plugins/**/*.js",
+    "lint": "eslint .",
+    "fix": "eslint . --fix",
     "changelog": "yarn conventional-changelog --preset conventionalcommits --release-count 2 | tail -n +2 | sed 's#https://git.drupal.org/project/ckeditor5_paste_filter/issues/#https://www.drupal.org/project/ckeditor5_paste_filter/issues/#g' | markdown-it",
     "bump": "yarn version --new-version $(conventional-recommended-bump --preset conventionalcommits)",
     "bump-unstable": "yarn version --new-version"
@@ -17,8 +17,10 @@
     "@ckeditor/ckeditor5-dev-utils": "^30.0.0",
     "conventional-changelog-cli": "^4.1.0",
     "conventional-recommended-bump": "^9.0.0",
-    "eslint-config-drupal": "^5.0.2",
+    "eslint": "8",
+    "eslint-plugin-drupal-contrib": "^2.0.3",
     "markdown-it": "^14.1.0",
+    "prettier": "3",
     "raw-loader": "^4.0.2",
     "terser-webpack-plugin": "^5.2.0",
     "webpack": "^5.51.1",