Add example use of UserHasBeenDeactivated hook

[hanzei]

Summary

Ticket Link

For mattermost/mattermost#20894

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 25 lines in your changes missing coverage. Please review.

Project coverage is 2.03%. Comparing base (cdf9067) to head (1770a5d).
Report is 15 commits behind head on master.

Files with missing lines	Patch %	Lines
server/user_hooks.go	0.00%	24 Missing ⚠️
server/login_hooks.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #166      +/-   ##
=========================================
- Coverage    2.06%   2.03%   -0.03%     
=========================================
  Files          14      14              
  Lines        1746    1769      +23     
=========================================
  Hits           36      36              
- Misses       1708    1731      +23     
  Partials        2       2              

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