Set `sync` setting for `limit_req_zone` when `zone_sync` is enabled

[shaun-nx]

Overview

The goal of this story is to ensure that the sync directive is appended to the end of any limit_req_zone in the NGINX configuration so that rate limit policies deployed can take advantage of zone_sync

Acceptance Criteria

• When zone_sync is enabled, the sync directive must be appended to the end of any limit_req_zone
• When zone_sync is disabled, the sync directive must be removed from the end of any limit_req_zone

[github-actions]

Hi @shaun-nx thanks for reporting!

Be sure to check out the docs and the Contributing Guidelines while you wait for a human to take a look at this 🙂

Cheers!