Prevent stale reads and use polygon WKB in CreateElementTranscriptions

Closes #471 (closed)

This should fix most of the issues with this endpoint, although the Sentry issue had started with some cases in preprod that I could not reproduce locally and that do not seem related to stale reads or polygon references.

assigned to @babadie and unassigned @erwanrouchet

changed the description

Codecov Report

Merging #1035 into master will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1035      +/-   ##
==========================================
+ Coverage   87.93%   87.94%   +0.01%     
==========================================
  Files         231      231              
  Lines       15298    15300       +2     
==========================================
+ Hits        13452    13456       +4     
+ Misses       1846     1844       -2     

Impacted Files	Coverage Δ
arkindex/documents/api/elements.py	98.53% <ø> (ø)
arkindex/documents/api/ml.py	97.78% <100.00%> (+0.01%)
...ocuments/tests/test_bulk_element_transcriptions.py	100.00% <100.00%> (ø)
arkindex/documents/tests/test_classes.py	100.00% <0.00%> (+0.77%)

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merged

mentioned in commit 55598238