refactor: Moves getUserDisplayName outside from meteor app

[dougfabris]

Proposed changes (including videos or screenshots)

It moves the auxiliary getUserDisplayName function to core-typings and useUserDisplayName hook to ui-client in order to give more flexibility to use them outside from meteor app

Issue(s)

Steps to test or reproduce

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[dionisio-bot]

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[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 59.47%. Comparing base (a9956c0) to head (ae290e6).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #35031      +/-   ##
===========================================
+ Coverage    59.43%   59.47%   +0.03%     
===========================================
  Files         2826     2828       +2     
  Lines        68170    68290     +120     
  Branches     15129    15148      +19     
===========================================
+ Hits         40520    40616      +96     
- Misses       24993    25016      +23     
- Partials      2657     2658       +1     

Flag	Coverage Δ
unit	75.69% <71.42%> (+0.01%)	⬆️

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[kodiakhq]

This PR currently has a merge conflict. Please resolve this and then re-add the ['stat: ready to merge', 'automerge'] label.