regression: Convert emoji shortname to unicode on notification emails

[gabriellsh]

Proposed changes (including videos or screenshots)

Issue(s)

Fixes undisclosed issue introduced in #31225

Steps to test or reproduce

Further comments

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Latest commit: 8071183

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (448e35a) 76.47% compared to head (8071183) 76.47%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #31521   +/-   ##
========================================
  Coverage    76.47%   76.47%           
========================================
  Files          278      278           
  Lines         9008     9008           
  Branches      1708     1708           
========================================
  Hits          6889     6889           
  Misses        1688     1688           
  Partials       431      431           

Flag	Coverage Δ
unit	76.47% <ø> (ø)

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