feat(DB): Introduce DB write concern env var for createStatements (LLC-2389)

[lucuilearningpool]

Closes LLC-2389.

[codecov[bot]]

Codecov Report

Patch coverage: 87.50% and project coverage change: -0.01 :warning:

Comparison is base (7e0f319) 93.92% compared to head (6484be4) 93.91%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #896      +/-   ##
==========================================
- Coverage   93.92%   93.91%   -0.01%     
==========================================
  Files         655      655              
  Lines        7146     7152       +6     
  Branches      795      796       +1     
==========================================
+ Hits         6712     6717       +5     
  Misses        314      314              
- Partials      120      121       +1     

Impacted Files	Coverage Δ
...nts/repo/modelsRepo/utils/mongoModels/constants.ts	85.71% <75.00%> (-14.29%)	:arrow_down:
...atements/repo/modelsRepo/createStatements/mongo.ts	100.00% <100.00%> (ø)

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