User should be warned about limitations when managing redirects on a staged site

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.3.5 CE GA6, 7.3.10 DXP GA1, Master
• Component/s: SEO Tools > URL Redirections
• Labels: None
• Story Points: 1
• Fix Priority: 4
• Git Pull Request: https://github.com/liferay-lima/liferay-portal/pull/643

It is expected for users to modify URL Redirections on the live site, so there should be some alert that appears if the user ends up trying to manage Redirections on the staged site.

Steps to reproduce:

1. Add a new site and enable staging
2. Navigate to staging site > Redirections

Expected result:
The user should be discouraged to use Redirections on staging, so the action buttons/icons should be disabled and an info message displayed.

The message could be similar to the disabled comments message on a staged site:

Actual result:
No warning is given, so a user may assume Redirections follows a typical staging workflow. However, he:

• Will not be able to publish redirection entries to live
• Will not be able to modify source URLs from the live site in the redirection entry
  so staging with redirects will be practically unusable for him.

Reproduced on:
Tomcat 9.0.33 + MySQL 5.7.
Portal master-private 73e2868650fbe778fbf120c0e895172196ec2e50