Remove custom handling for text field package (#3250)

Author: ethanshar

scripts/buildPackages/buildCustomPackages.js

@@ -14,10 +14,6 @@ const packages = [
     filename: 'constants.js',
     content: `module.exports = require('./src/commons/Constants').default;\n`
   },
-  {
-    filename: 'textField.js',
-    content: `module.exports = require('./src/components/textField/TextFieldMigrator').default;\n`
-  },
   {
     filename: 'core.js',
     components: ['View', 'Text', 'Image', 'TouchableOpacity', 'Button'],