Optimize Revision.state and ListWorkerVersions

Codecov Report

Merging #1038 into master will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1038   +/-   ##
=======================================
  Coverage   87.87%   87.88%           
=======================================
  Files         235      235           
  Lines       15187    15193    +6     
=======================================
+ Hits        13346    13352    +6     
  Misses       1841     1841

Impacted Files	Coverage Δ
arkindex/dataimport/api.py	`99.25% <100.00%> (ø)`
arkindex/dataimport/models.py	`41.00% <100.00%> (+0.49%)`
arkindex/dataimport/serializers/workers.py	`100.00% <100.00%> (ø)`
arkindex/dataimport/tests/test_workers.py	`100.00% <100.00%> (ø)`

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