build: Use prettier for javascript

Stop ignoring .js and .json files in prettier and fix existing issues.

The `prettier-plugin-multiline-arrays` plugin is used to split arrays
with multiple elements into one line per element.

package.json

@@ -112,6 +112,7 @@
     "karma-junit-reporter": "1.2.0",
     "lint-staged": "^15.2.10",
     "prettier": "^3.3.3",
+    "prettier-plugin-multiline-arrays": "^3.0.6",
     "protractor": "~7.0.0",
     "puppeteer": "^15.3.2",
     "stylelint": "^16.10.0",