URLs in scan result details are broken if there is a trailing comma

Problem/Motivation

This error from rector:

> Drupal\Tests\BrowserTestBase::$defaultTheme is required. See https://www.drupal.org/node/3083055 → , which includes recommendations on which theme to use

is output with this URL:

> https://www.drupal.org/node/3083055 → ,

Which is broken because of the ','.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes