chore: QoL changes for Omnichannel

[KevLehman]

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Further comments

• More projections, so less data fetched from mongo
• Changed the logic of BH from one agg to check if a user was an agent on department to one single aggregation for all users
• Changed the logic of BH from one query to check if a user was without a department to one single query for all users
• Removed unnecessary checks on livechat/department and do all in one single call
• Updated callback types & removed anys

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Latest commit: c9b31d7

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[codecov]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (75d235a) 49.55% compared to head (c9b31d7) 49.54%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #31468      +/-   ##
===========================================
- Coverage    49.55%   49.54%   -0.02%     
===========================================
  Files         3313     3311       -2     
  Lines        81476    81470       -6     
  Branches     16710    16706       -4     
===========================================
- Hits         40378    40364      -14     
- Misses       36392    36404      +12     
+ Partials      4706     4702       -4     

Flag	Coverage Δ
e2e	53.15% <ø> (-0.01%)	⬇️
e2e-api	40.66% <61.90%> (-0.02%)	⬇️
unit	76.51% <ø> (ø)

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