Document Fastly WAF Configuration and Maintenance

[data-sync-user]

We want good and clear documentation on the WAF. See references below to create a space in Confluence

WAF - to roll out Oct 2, 2025

• https://github.com/mozilla/webservices-infra/blob/main/sync/tf/prod/waf.tf
• Tokenserver: https://github.com/mozilla/webservices-infra/blob/2f25a0bbf2d69cfaa490081368adbba54cbe0c1f/sync/tf/modules/waf_rules_sync/main.tf  
• Syncstorage: https://github.com/mozilla/webservices-infra/blob/2f25a0bbf2d69cfaa490081368adbba54cbe0c1f/sync/tf/modules/waf_rules_sync_server/main.tf  

WAFLY link for rules +https://dashboard.signalsciences.net/corps/mozilla/sites/sync-nonprod-stage/rules+

AND from Fastly Readiness meeting https://docs.google.com/document/d/1V5o7Hvy0ZZQutu2zf21BzbIhGSKpc5XmnN26jHWbjVg/edit?tab=t.0#heading=h.47ntf0v3tkt0

┆Issue is synchronized with this Jira Task