Backport 10.1: Pages object storage validation fixes

Lucas Lirequested to merge
lucas/pages-objectstore-bp-10-1 into 10-1-stable

What does this MR do?

This MR backports !5124 (merged) and !5134 (merged) to 10.0

Related issues

https://gitlab.com/gitlab-com/gl-infra/gitlab-dedicated/team/-/work_items/12900

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