Troubleshoot draft preview `404` issue

[ericdrosas87]

Draft preview-in-craft pages are 404ing, I need to do root cause analysis to determine if this is expected or not and if not then what is causing the 404.

[ericdrosas87]

Findings:

Craft admins should be able to see disabled drafts within the preview slideout. There was a high cache-hit ratio around the time of the intermittent 404s, this confirms Jared's response from Google Cloud support that the gateway is overwriting our negative cache policy. An update has been made to the client repo to explicitly return a 404 response with the no-store header to see if this prevents caching moving forward.