refactor(omnichannel): replace create and find by findAndUpdate

[ggazzo]

OPI-22

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.65%. Comparing base (7745bc3) to head (64affd8).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #32773      +/-   ##
===========================================
- Coverage    56.66%   56.65%   -0.02%     
===========================================
  Files         2501     2504       +3     
  Lines        55489    55518      +29     
  Branches     11435    11446      +11     
===========================================
+ Hits         31444    31454      +10     
- Misses       21367    21376       +9     
- Partials      2678     2688      +10     

Flag	Coverage Δ
e2e	56.46% <ø> (-0.03%)	⬇️
unit	72.22% <ø> (+0.01%)	⬆️

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