GitLab Pages Azure-to-GCP verification process

One of the final GitLab Pages tasks, as part of #220 (closed), is to ensure that the GitLab pages data, after being copied from Azure Pages to GCP Pages is valid, correct, up-to-date and not corrupt.

As yet, the approach to conducting this verification has not been discussed.

This issue will track the creation of a process of validation.

To get the ball rolling: has anyone considered an approach to conducting this?

cc @jacobvosmaer-gitlab @nick.thomas @ahanselka @dawsmith @jarv

Weight set to 4 initially...