Deleting CMS page via webapi/cron should remove related URL rewrites

[unicoder88]

Preconditions

1. Magento 2.2.3 Commerse edition - but any 2.2, I just have a fresh EE install to prove
2. Apache/2.4.27 (Ubuntu)
3. PHP 7.0.26-2+ubuntu17.10.1+deb.sury.org+2

Steps to reproduce

1. Create new access token

• System > Integrations > Add New Integration
• set any name, give access to API resources Content > Elements > Pages https://prnt.sc/j6rek2, save
• Click Activate > Allow on new integration, copy access token https://prnt.sc/j6reuq

2. We want to delete CMS page 'About US' https://prnt.sc/j6rf4o and free url_rewrite about-us. Check url_rewrite table has a record before deleting.
3. Make a REST API call DELETE http://m22ee.local/rest/V1/cmsPage/8, supply Authorization: Bearer {token} header. https://prnt.sc/j6rfk3
4. Check that the page is gone in admin https://prnt.sc/j6rfr3
5. Now check url_rewrite table. Old rewrite is not deleted https://prnt.sc/j6rfe3.
6. Now try to create a new CMS page with identifier about-us that should have become available. You get an error https://prnt.sc/j6rfyz.

Expected result

1. After deleting CMS page via API or in crontab area, according URL rewrites should be removed.

Actual result

1. Module Magento_CmsUrlRewrite declares plugin cms_url_rewrite_plugin only in adminhtml area, this should be moved to global area.
   https://prnt.sc/j6rgtj

[magento-cicd2]

All committers have signed the CLA.

[magento-engcom-team]

@unicoder88 thank you for contributing. Please accept Community Contributors team invitation here to gain extended permissions for this repository.

[magento-engcom-team]

Hi @orlangur, thank you for the review.
ENGCOM-1314 has been created to process this Pull Request

[magento-engcom-team]

Hi @unicoder88. Thank you for your contribution.
Changes from your Pull Request will be available with the upcoming 2.2.5 release.