Bitbucket Cloud integration REST endpoint ignores security settings for anonymous users

Issue Summary

This is reproducible on Data Center: (yes) / (no)

Steps to Reproduce

1. Remove Anonymous user VIEW global permission
2. Uncheck "Allow anonymous users to trigger remote repository change detection and Bamboo Specs detection" checkbox at Security settings
3. Call POST /rest/bitbucket-cloud/latest/webhooks REST endpoint as anonymous user

Expected Results

Http response 401 should be returned as admin doesn't allow anonymous user to trigger change detection or specs scanning

Actual Results

204 Http response is returned for a valid payload

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available