Cloning public repositories from a Mirror does not work

Summary

Cloning a public repository from a mirror does not work without credentials

Steps to Reproduce

1. Start Bitbucket Server instance and Mirror
2. Create a public repository on the primary
3. Sync the repository to the mirror
4. Attempt to clone the repository over HTTP without using credentials

Expected Results

The clone succeeds without prompting for credentials.

Actual Results

The clone fails and asks for credentials. Entering valid credentials makes the clone succeed.

Cause

This is caused by validateAuthenticated calls in a mirror specific SCM request check.

Workaround

Clone from upstream.