fix: dataset metadata response parsing

[MDunitz]

Reviewers

Functional:

• @ebezzi
  Readability:

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Changes

• modify dataset metadata retrieval code to properly handle response body

[codecov]

Codecov Report

Merging #43 (7f1c599) into main (2ba9729) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #43   +/-   ##
=======================================
  Coverage   69.22%   69.22%           
=======================================
  Files         100      100           
  Lines        9026     9026           
=======================================
  Hits         6248     6248           
  Misses       2778     2778           

Flag	Coverage Δ
frontend	69.22% <100.00%> (ø)
javascript	69.22% <100.00%> (ø)
smokeTest	?
unitTest	69.22% <100.00%> (ø)

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

Impacted Files	Coverage Δ
backend/czi_hosted/data_common/dataset_metadata.py	89.79% <100.00%> (ø)
data_common/dataset_metadata.py	89.79% <0.00%> (ø)

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