Improving artifact info and study listing

[antgonza]

Based on #2147 so review that one first (note that it's also in WIP so don't review anything 😄 ).

[ElDeveloper]

👍

[josenavas]

Good to merge once tests pass

[codecov-io]

Codecov Report

Merging #2149 into analysis-refactor will decrease coverage by 0.01%.
The diff coverage is 97.22%.

@@                  Coverage Diff                  @@
##           analysis-refactor    #2149      +/-   ##
=====================================================
- Coverage              92.06%   92.04%   -0.02%     
=====================================================
  Files                    188      188              
  Lines                  19474    19508      +34     
=====================================================
+ Hits                   17928    17957      +29     
- Misses                  1546     1551       +5

Impacted Files	Coverage Δ
qiita_pet/handlers/api_proxy/__init__.py	100% <ø> (ø)	⬆️
qiita_pet/handlers/study_handlers/__init__.py	100% <ø> (ø)	⬆️
qiita_pet/webserver.py	100% <ø> (ø)	⬆️
...lers/study_handlers/tests/test_listing_handlers.py	99.3% <ø> (-0.01%)	⬇️
...pet/handlers/study_handlers/tests/test_artifact.py	97.08% <100%> (+0.21%)	⬆️
qiita_pet/handlers/api_proxy/artifact.py	99.2% <100%> (+0.02%)	⬆️
...iita_pet/handlers/api_proxy/tests/test_artifact.py	98.19% <100%> (+0.05%)	⬆️
qiita_db/test/test_util.py	99.78% <100%> (ø)	⬆️
qiita_pet/handlers/study_handlers/artifact.py	95.38% <100%> (+0.38%)	⬆️
qiita_db/util.py	96.49% <95.34%> (-0.37%)	⬇️
... and 2 more

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