[MM-21184] Enabled Hermes (#3814)

* Enable Hermes

* Don't sort emojis in selector

* No need for transformer

* Remove unnecessary packager files

packager/generateModulePaths.js

@@ -1,46 +0,0 @@
-// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
-// See LICENSE.txt for license information.
-
-/* eslint-disable no-console */
-const execSync = require('child_process').execSync;
-const fs = require('fs');
-const moduleNames = require('./moduleNames');
-
-const pjson = require('../package.json');
-const localPrefix = `${pjson.name}/`;
-
-// Transforming to Module Paths
-// This script will convert the module names found in moduleNames.js
-// to the absolute module path that we need.
-const modulePaths = moduleNames.map((moduleName) => {
-    if (moduleName.startsWith(localPrefix)) {
-        return `./${moduleName.substring(localPrefix.length)}`;
-    }
-    if (moduleName.endsWith('.js')) {
-        return `./node_modules/${moduleName}`;
-    }
-    try {
-        const result = execSync(
-            `grep "@providesModule ${moduleName}" $(find . -name ${moduleName}\\\\.js) -l`
-        ).toString().trim().split('\n')[0];
-
-        if (result != null) {
-            return result;
-        }
-    } catch (e) {
-        return null;
-    }
-    return null;
-});
-
-const paths = modulePaths.filter((path) => path != null).map((path) => `'${path}'`).join(',\n');
-
-const fileData = `module.exports = [${paths}];`;
-
-fs.writeFile('./packager/modulePaths.js', fileData, (err) => {
-    if (err) {
-        console.log(err);
-    }
-
-    console.log('Done');
-});