WT-6625 Remove outdated TODO

[tetsuo-cpp]

This TODO comment refers to a ticket that has been closed which was flagged by some PM script.

We still don't know what to do about checkpoint cursors yet but we do have WT-5927 to track this issue so I've replaced it with a FIXME and marked it appropriately.

[quchenhao]

Why not directly change the usage of checkpoint cursor? We can use simulate_crash_restart to achieve the same behavior I think.

[tetsuo-cpp]

Why not directly change the usage of checkpoint cursor? We can use simulate_crash_restart to achieve the same behavior I think.

That invalidates the test. It's specifically about reading from history store which isn't the case if you restart and run rollback to stable.

I could move that part to the end of the test if you'd prefer that. The reason I haven't done this is because we're not sure what will happen with checkpoint cursors and may want to revert the original version of this test.

[quchenhao]

lgtm. I'm fine waiting until we have made a decision on checkpoint cursor.

[hbokhari]

LGTM. Better to leave the test intact so we can revisit once checkpoint cursors are operational again.