DefaultTileStore: should ignore .tmp files

[favyen2]

get_raster_bounds throws error if there are multiple non-completed files in the raster directory. But this situation can arise if an ingest job fails, leaving a temporary file (due to the atomic write code), and then a later ingest job succeeds. We should ignore .tmp files in get_raster_bounds and read_raster. Maybe we can write a test that passes a custom UPath to write_raster_file which fails halfway, which should yield a .tmp file, and then write a normal raster file, and then try to read it?