Convert the streaming server to ESM (#29389)

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

streaming/.eslintrc.js

@@ -1,43 +0,0 @@
-// @ts-check
-const { defineConfig } = require('eslint-define-config');
-
-module.exports = defineConfig({
-  extends: ['../.eslintrc.js'],
-  env: {
-    browser: false,
-  },
-  parserOptions: {
-    project: true,
-    tsconfigRootDir: __dirname,
-    ecmaFeatures: {
-      jsx: false,
-    },
-    ecmaVersion: 2021,
-  },
-  rules: {
-    // In the streaming server we need to delete some variables to ensure
-    // garbage collection takes place on the values referenced by those objects;
-    // The alternative is to declare the variable as nullable, but then we need
-    // to assert it's in existence before every use, which becomes much harder
-    // to maintain.
-    'no-delete-var': 'off',
-
-    // The streaming server is written in commonjs, not ESM for now:
-    'import/no-commonjs': 'off',
-
-    // This overrides the base configuration for this rule to pick up
-    // dependencies for the streaming server from the correct package.json file.
-    'import/no-extraneous-dependencies': [
-      'error',
-      {
-        devDependencies: [
-          'streaming/.eslintrc.js',
-        ],
-        optionalDependencies: false,
-        peerDependencies: false,
-        includeTypes: true,
-        packageDir: __dirname,
-      },
-    ],
-  },
-});