Dont tag urls because performance

What does this MR do?

Removes tagging of URLs scanned because they take a long time to run, and don't appear to affect any of the execution of vulnerabilities.

An end-to-end test hasn't been added for this change, because the RegexAutoTagScanner ZAP class doesn't log, making it hard to verify what has taken place. Logging does occur when the scanner takes more than 5 seconds to scan a page, however, the effort to generate the page required for that is beyond the scope of this issue.

What are the relevant issue numbers?

gitlab-org/gitlab#230687 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
  • Job definition example
  • Vendored CI Templates (also in CE)
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer