In disaggregated storage mode, table metadata lives in two places: the local WiredTiger metadata table and the shared metadata table in the page server (WiredTigerShared.wt_stable). We need to add a shared metadata consistency check to the verify path when running in disagg mode.

Possible checks:

• For each entry in WiredTigerShared.wt_stable, confirm a matching local metadata entry exists
• For each local file entry, confirm a corresponding shared entry exists