Bugfix: make listing of S3 objects faster in storage

[sanderegg]

What do these changes do?

calling aiobotocore.list_objects_v2 method with a Prefix is several order of magnitudes faster when Prefix is ending with a /

e.g.:
looking for files in of project 0000802f-1e81-551f-8ab2-769c941aac66:

client.list_objects_v2(Prefix="0000802f-1e81-551f-8ab2-769c941aac66") # this is SLOWWWWWWWWWW
client.list_objects_v2(Prefix="0000802f-1e81-551f-8ab2-769c941aac66/") # this is FASTTTTTTTTTT

for example on master, the first call takes 12 seconds to complete... while the second call takes a few ms...

Related issue/s

How to test

Checklist

[codecov]

Codecov Report

Merging #2329 (a9a9605) into master (e0b4343) will decrease coverage by 0.0%.
The diff coverage is 100.0%.

@@           Coverage Diff            @@
##           master   #2329     +/-   ##
========================================
- Coverage    71.7%   71.7%   -0.1%     
========================================
  Files         506     506             
  Lines       19925   19926      +1     
  Branches     1950    1950             
========================================
- Hits        14303   14288     -15     
- Misses       5146    5160     +14     
- Partials      476     478      +2     

Flag	Coverage Δ
integrationtests	61.9% <ø> (-0.1%)	⬇️
unittests	67.0% <100.0%> (-0.1%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ervices/storage/src/simcore_service_storage/dsm.py	70.2% <100.0%> (-2.4%)	⬇️
...ce_webserver/resource_manager/garbage_collector.py	74.8% <0.0%> (-2.8%)	⬇️
.../director/src/simcore_service_director/producer.py	60.8% <0.0%> (+0.2%)	⬆️

[pcrespov]

subtle! 👍

[GitHK]

🤯

[KZzizzle]

wow