refactor: remove send confirmation email method calls (server)

[MarcosSpessatto]

https://rocketchat.atlassian.net/browse/CORE-939

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[dionisio-bot]

Looks like this PR is not ready to merge, because of the following issues:

• This PR is targeting the wrong base branch. It should target 7.4.0, but it targets 7.3.0

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[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.12%. Comparing base (18ba1a0) to head (c2f248a).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #35014      +/-   ##
===========================================
- Coverage    59.12%   59.12%   -0.01%     
===========================================
  Files         2822     2822              
  Lines        67856    67849       -7     
  Branches     15129    15129              
===========================================
- Hits         40122    40116       -6     
+ Misses       24908    24907       -1     
  Partials      2826     2826              

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unit	75.00% <ø> (ø)

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