Update migration script

[jmgrady]

Update database migration script for updating SemanticDomains field of the senses in the FrontierCollection and the WordsCollection.

• Adds _id field for the MongoDB ObjectId for the document in the SemanticDomains collection. If the semantic domain id and name do not match any of the domains in the collection, null is used;
• Changes the guid field from a UUID type to str type to match the SemanticDomains collection and the data model.
• Reverts the change to the script to update the SemanticDomains collection to use the merge mode instead of upsert so that only changed documents are updated.

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This change is 

[codecov-commenter]

Codecov Report

Base: 51.38% // Head: 51.44% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (8922383) compared to base (721a3ee).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1749      +/-   ##
==========================================
+ Coverage   51.38%   51.44%   +0.05%     
==========================================
  Files         277      277              
  Lines        8569     8569              
  Branches      630      630              
==========================================
+ Hits         4403     4408       +5     
+ Misses       3661     3656       -5     
  Partials      505      505              

Flag	Coverage Δ
backend	79.11% <ø> (+0.14%)	⬆️
frontend	32.25% <ø> (ø)

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

Impacted Files	Coverage Δ
Backend/Helper/DuplicateFinder.cs	88.76% <0.00%> (+2.80%)	⬆️

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[jasonleenaylor]

Reviewed 2 of 2 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @jmgrady)