Level streaming will incorrectly stream levels with similar names

When streaming levels where one level has a partial name of another level, the incorrect level will be found and streamed rather than the desired level.

Ex:
When attempting to stream a level named Car and another level named ThisNewCar exists, level ThisNewCar will be found and streamed instead.

Not reproduced internally, no repro steps available.

Don't use map names that differ only by a prefix