metamorphic: convert some DB.Deletes into DB.SingleDeletes #3109
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This commit adjusts the metamorphic test to increase coverage of single deletes. Randomized configurations will, at runtime, consider performing a SingleDelete instead of a Delete on a subset of delete operations performed on (*pebble.DB) objects. These instances create a short-lived iterator, seek to the key and use pebble.CanDeterministicallySingleDelete to determine whether a single delete should be equivalent to a delete. If it should be, a SingleDelete is written instead.
Closes #3108.