properly handle region_name in MPath for S3 paths

[ungarj]

fixes #666

[github-actions]

missing coverage

File	Stmts	Miss	Cover	Missing
__init__.py	33	0	100%
_deprecated.py	18	0	100%
bounds.py	98	0	100%
enums.py	31	0	100%
errors.py	17	0	100%
grid.py	35	0	100%
index.py	179	0	100%
log.py	50	0	100%
path.py	389	0	100%
pretty.py	16	0	100%
protocols.py	14	0	100%
registered.py	5	0	100%
settings.py	33	0	100%
stac.py	147	0	100%
testing.py	101	0	100%
tile.py	197	0	100%
timer.py	37	0	100%
types.py	39	0	100%
validate.py	65	0	100%
zoom_levels.py	98	0	100%
cli
__init__.py	0	0	100%
main.py	9	0	100%
mpath.py	82	0	100%
options.py	128	0	100%
progress_bar.py	37	0	100%
cli/default
__init__.py	0	0	100%
convert.py	63	0	100%
cp.py	33	0	100%
create.py	36	0	100%
execute.py	42	0	100%
formats.py	19	0	100%
index.py	42	0	100%
processes.py	18	0	100%
rm.py	25	0	100%
serve.py	69	0	100%
stac.py	60	0	100%
commands
__init__.py	6	0	100%
convert.py	78	0	100%
cp.py	65	0	100%
execute.py	70	0	100%
index.py	34	0	100%
observer.py	9	0	100%
parser.py	91	0	100%
rm.py	44	0	100%
config
__init__.py	4	0	100%
base.py	357	0	100%
models.py	180	0	100%
parse.py	76	0	100%
process_func.py	89	0	100%
executor
__init__.py	17	0	100%
base.py	77	0	100%
concurrent_futures.py	70	0	100%
dask.py	105	0	100%
future.py	83	0	100%
sequential.py	33	0	100%
types.py	13	0	100%
formats
__init__.py	3	0	100%
base.py	174	0	100%
drivers.py	0	0	100%
loaders.py	43	0	100%
protocols.py	13	0	100%
tools.py	153	0	100%
formats/default
__init__.py	0	0	100%
_fiona_base.py	51	0	100%
flatgeobuf.py	14	0	100%
geojson.py	12	0	100%
gtiff.py	195	0	100%
mapchete_input.py	16	0	100%
png.py	66	0	100%
png_hillshade.py	56	0	100%
raster_file.py	85	0	100%
tile_directory.py	101	0	100%
vector_file.py	117	0	100%
geometry
__init__.py	10	0	100%
clip.py	41	0	100%
filter.py	35	0	100%
footprints.py	39	0	100%
latlon.py	30	0	100%
repair.py	12	0	100%
reproject.py	66	0	100%
segmentize.py	23	0	100%
shape.py	12	0	100%
transform.py	28	0	100%
types.py	24	0	100%
io
__init__.py	7	0	100%
_json.py	6	0	100%
_misc.py	79	0	100%
_path.py	0	0	100%
profiles.py	6	0	100%
io/raster
__init__.py	8	0	100%
array.py	107	0	100%
convert.py	23	0	100%
mosaic.py	103	0	100%
open.py	14	0	100%
read.py	169	0	100%
referenced_raster.py	97	0	100%
write.py	100	0	100%
io/vector
__init__.py	9	0	100%
convert.py	26	0	100%
indexed_features.py	178	0	100%
open.py	15	0	100%
read.py	75	0	100%
types.py	8	0	100%
write.py	98	0	100%
processes
__init__.py	17	0	100%
clip.py	16	0	100%
contours.py	52	0	100%
convert.py	38	0	100%
hillshade.py	49	0	100%
processes/examples
__init__.py	0	0	100%
example_process.py	6	0	100%
processing
__init__.py	3	0	100%
base.py	271	0	100%
execute.py	71	0	100%
mp.py	26	0	100%
tasks.py	291	0	100%
types.py	45	0	100%
processing/profilers
__init__.py	5	0	100%
memory.py	60	0	100%
requests.py	25	0	100%
time.py	22	0	100%
static
__init__.py	0	0	100%
process_template.py	1	0	100%
TOTAL	7311	0	100%