Currently we have assertions around what oplog events should reach change stream transformer. For example:

https://github.com/mongodb/mongo/blob/b61c79e53b8fd9ae3b2c86a5ba6be6e19d8e308b/src/mongo/db/pipeline/change_stream_event_transform.cpp#L499

However, if an oplog entry leaks through (due to a bug, probably) a resulting assert message will contain very little information and will be hard to debug.

We should log the offending oplog entry type (and maybe the whole entry, but redacted) to make such errors easier to debug.