Add explicit tests for Pages replication through Geo

What does this MR do and why?

Original MR in !70190 (merged) added general tests for replicating objects with/without object storage and selective sync enabled, this adds test explicitly for the Pages model.

Closes #340628 (closed)

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How to set up and validate locally

• This only contains a spec addition for !70190 (merged)

MR acceptance checklist

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