test: Unit tests for AutoCloseOnHold scheduler

[KevLehman]

https://rocketchat.atlassian.net/browse/CORE-262

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Unit tests for AutoCloseOnHold scheduler.

This installs chai-datetime package to assert the when parameters sent to the scheduler are close to the time we want it to be.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.45%. Comparing base (9cc8e3d) to head (216b047).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #32213      +/-   ##
===========================================
- Coverage    55.44%   53.45%   -2.00%     
===========================================
  Files         2328     2236      -92     
  Lines        51371    49977    -1394     
  Branches     10513    10177     -336     
===========================================
- Hits         28483    26714    -1769     
- Misses       20377    20872     +495     
+ Partials      2511     2391     -120     

Flag	Coverage Δ
e2e	50.75% <ø> (-4.12%)	⬇️
unit	75.37% <100.00%> (+0.41%)	⬆️

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