When the test was trying to test recovering translog ops,
since we flush on close/shutdown, it failed because it never
recovered any translog ops.
The code for translog recovery is irrelevant due to that and
this PR proposes to remove it.
Alternatively, we could simulate killing nodes forcibly before
upgrading, but (a) that seems out of the ordinary for upgrades,
and (b) in trying that, it did not consistently pass the test
because sometimes the flush on close still happened.
Fixes#52031
aa862640e5