Summary
Discovered during refactor work in WT-8673. It's best to wait for WT-8673 to be merged before starting this ticket.

WT-5630 adds a #define WT_MIN_STARTUP_VERSION which prevents WiredTiger from starting on versions older than 3.2.0, which should make code checking for older versions (such as WT_LOG_V3_VERSION, see the FIXME in the code) no longer required.

Check that values such as WT_LOG_V3_VERSION are now redundant and remove any dead code that follows from their removal.

Motivation

• Does this affect any team outside of WT?
  No

• How likely is it that this use case or problem will occur?
  N/A

• If the problem does occur, what are the consequences and how severe are they?
  N/A

• Is this issue urgent?
  No

Acceptance Criteria (Definition of Done)
Verify that the above code can be removed with no impact on WiredTiger, and if so clean up the dead code.