reintroduce last_insert_id discrepancy

[jycor]

Apparently the last_insert_id in ok result, is not the same as select last_insert_id().
When there is an auto_increment column, the insert_id in the OKResult is the first value that increments the auto_increment value.

Reverts some changes from: #2616
fixes: dolthub/dolt#8914

[max-hoffman]

The changes are simple, the rules for what's happening don't seem very simple. A paragraph somewhere describing what should be happening for people to refer to in the future would be helpful.