[Forwardport] Refactor JavsScript for UrlRewrite module edit page

[vijay-wagento]

Original Pull Request

magento#15422
Refactor JavaScript for admin module URL rewrite edit page

Description

Refactor JavaScript for admin module URL rewrite edit page

Fixed Issues (if relevant)

1. Refactore javascript for module URL rewrite magento/magento2#15356: Refactore javascript for module URL rewrite

Manual testing scenarios

1. Go to Marketing > URL Rewrites > Edit
2. Remove Request Path text box value and try to save it.

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)