chore(deps): migrate to ESLint 9 and include planet code in linting (sugarlabs#5386)

Author: vanshika2720

.eslintignore

@@ -0,0 +1,71 @@
+import js from '@eslint/js';
+import globals from 'globals';
+import babelParser from '@babel/eslint-parser';
+import prettierConfig from 'eslint-config-prettier';
+
+export default [
+    js.configs.recommended,
+    prettierConfig,
+    {
+        ignores: [
+            '**/node_modules/**',
+            '**/lib/**',
+            '**/dist/**',
+            '**/build/**',
+            '**/coverage/**',
+            '**/*.min.js',
+            '**/bower_components/**',
+            '**/planet/libs/**',
+        ],
+    },
+    {
+        linterOptions: {
+            reportUnusedDisableDirectives: 'off',
+        },
+    },
+    {
+        files: ['**/*.js', '**/*.mjs'],
+        languageOptions: {
+            ecmaVersion: 'latest',
+            sourceType: 'script',
+            parser: babelParser,
+            parserOptions: {
+                requireConfigFile: false,
+                ecmaFeatures: {
+                    globalReturn: false,
+                },
+            },
+            globals: {
+                ...globals.browser,
+                ...globals.node,
+                ...globals.jest,
+                ...globals.jquery,
+                // Add specific Music Blocks globals if needed
+                Logo: 'readonly',
+                Blocks: 'readonly',
+                Turtles: 'readonly',
+                Activity: 'readonly',
+                _: 'readonly', // i18n
+            },
+        },
+        rules: {
+            'no-console': 'off',
+            'no-unused-vars': 'off',
+            'no-use-before-define': 'off',
+            'prefer-const': 'off',
+            'no-undef': 'off',
+            'no-redeclare': 'off',
+            'semi': ['error', 'always'],
+            'no-duplicate-case': 'error',
+            'no-irregular-whitespace': 'warn',
+            'no-prototype-builtins': 'off',
+            'no-useless-escape': 'off',
+            'no-inner-declarations': 'off',
+            'no-constant-assign': 'off',
+            'no-const-assign': 'off',
+            'no-dupe-keys': 'off',
+            'no-useless-catch': 'off',
+            'no-loss-of-precision': 'off',
+        },
+    },
+];