WT-8170 (broadly) aims to improve the WT timestamp assertions. This ticket is to make the accompanying changes for MDB. We'll the following changes:

• Apply the mixed_mode assertion to the following tables that currently have no assertions:
  • internal-
  • oplog (obsoleted as WT no longer saves TS information on logged tables and therefore disables assertions)
  • config.system.indexBuilds (record store and indexes)

We expect to move config.system.indexBuilds (in addition to the _mdb_catalog, which currently has an out of timestamp order write and no assertions today) to ordered. See SERVER-60753 and SERVER-60754.

Ideally this patch can go in without causing any testing failures such that WT-8170 can be dropped at a later time. If that's not viable, we will coordinate a dance of:

• Disable assertions in a patch
• Drop WT-8170
• Re-enable assertions