chore: Update to eslint v9 (#525)

* chore(deps-dev): bump the eslint group across 1 directory with 2 updates

Bumps the eslint group with 2 updates in the /assets directory: [eslint](https://github.com/eslint/eslint) and [eslint-plugin-react-hooks](https://github.com/facebook/react/tree/HEAD/packages/eslint-plugin-react-hooks).


Updates `eslint` from 8.57.0 to 9.12.0
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](eslint/eslint@v8.57.0...v9.12.0)

Updates `eslint-plugin-react-hooks` from 4.6.2 to 5.0.0
- [Release notes](https://github.com/facebook/react/releases)
- [Changelog](https://github.com/facebook/react/blob/main/packages/eslint-plugin-react-hooks/CHANGELOG.md)
- [Commits](https://github.com/facebook/react/commits/[email protected]/packages/eslint-plugin-react-hooks)

---
updated-dependencies:
- dependency-name: eslint
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: eslint
- dependency-name: eslint-plugin-react-hooks
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: eslint
...

Signed-off-by: dependabot[bot] <[email protected]>

* Migrate config file to new format.

* Fix lint issues.

* File format.

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

assets/eslint.config.mjs

@@ -0,0 +1,97 @@
+import { fixupConfigRules, fixupPluginRules } from "@eslint/compat";
+import typescriptEslint from "@typescript-eslint/eslint-plugin";
+import react from "eslint-plugin-react";
+import jsxA11Y from "eslint-plugin-jsx-a11y";
+import tsParser from "@typescript-eslint/parser";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import js from "@eslint/js";
+import { FlatCompat } from "@eslint/eslintrc";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all,
+});
+
+export default [
+  {
+    ignores: [
+      "**/webpack.config.js",
+      "**/.eslintrc.js",
+      "**/socket.js",
+      "**/node_modules",
+      "**/coverage",
+    ],
+  },
+  ...fixupConfigRules(
+    compat.extends(
+      "eslint:recommended",
+      "plugin:@typescript-eslint/recommended",
+      "plugin:react/recommended",
+      "plugin:jsx-a11y/recommended",
+      "plugin:react-hooks/recommended",
+    ),
+  ),
+  {
+    plugins: {
+      "@typescript-eslint": fixupPluginRules(typescriptEslint),
+      react: fixupPluginRules(react),
+      "jsx-a11y": fixupPluginRules(jsxA11Y),
+    },
+
+    linterOptions: {
+      reportUnusedDisableDirectives: true,
+    },
+
+    languageOptions: {
+      parser: tsParser,
+      ecmaVersion: 5,
+      sourceType: "script",
+
+      parserOptions: {
+        ecmaFeatures: {
+          jsx: true,
+        },
+      },
+    },
+
+    settings: {
+      react: {
+        version: "detect",
+      },
+    },
+
+    rules: {
+      "no-console": 0,
+      "prefer-rest-params": "off",
+      "@typescript-eslint/ban-ts-comment": "off",
+      "@typescript-eslint/no-explicit-any": "off",
+
+      "@typescript-eslint/no-unused-vars": [
+        "error",
+        {
+          argsIgnorePattern: "^_.*",
+          varsIgnorePattern: "^_.*",
+          destructuredArrayIgnorePattern: "^_.*",
+        },
+      ],
+
+      "react/display-name": "off",
+
+      "react/function-component-definition": [
+        "error",
+        {
+          namedComponents: "arrow-function",
+          unnamedComponents: "arrow-function",
+        },
+      ],
+
+      "react/no-danger": "error",
+      "jsx-a11y/no-static-element-interactions": "off",
+      "jsx-a11y/click-events-have-key-events": "off",
+    },
+  },
+];

assets/js/components/OutfrontTakeoverTool/AlertDashboard/PastAlertsList.tsx

@@ -1,4 +1,3 @@
-/* eslint-disable react/prop-types */
 import React from "react";
 import PastAlertDetails from "./PastAlertDetails";
 import {

assets/js/components/OutfrontTakeoverTool/AlertWizard/AlertWizard.tsx

@@ -1,4 +1,3 @@
-/* eslint-disable react/prop-types */
 import React from "react";
 import ConfirmationPage from "./ConfirmationPage";
 import CreateMessage from "./CreateMessage";

assets/js/components/OutfrontTakeoverTool/AlertWizard/SVGPreviews.tsx

@@ -1,4 +1,3 @@
-/* eslint-disable react/prop-types */
 import React from "react";
 
 import {

assets/js/components/OutfrontTakeoverTool/AlertWizard/WizardSidebar.tsx

@@ -1,4 +1,3 @@
-/* eslint-disable react/prop-types */
 import React from "react";
 import StackedStationCards from "./StackedStationCards";