test: Automated tests for display mode settings.

[Harmeet221]

JIRA Task: https://rocketchat.atlassian.net/browse/QA-75

Automated following test cases:-

1. expect to select display mode as Extendedand verify if sidebar item contains a message.
2. expect to select display mode as Medium' and verify if sidebar item does not contain a message
3. expect to select display mode as condensed and verify if sidebar item is condensed and its size is reduced to 28
4. expect to display Avatars
5. expect to hide Avatars.

[dionisio-bot[bot]]

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Latest commit: 185940eade8fa19df315cebbbceb5e5a2f490451

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 64.52%. Comparing base (d6fa67e) to head (77a7168).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #36026      +/-   ##
===========================================
- Coverage    64.61%   64.52%   -0.09%     
===========================================
  Files         3128     3278     +150     
  Lines        98189   101355    +3166     
  Branches     18636    18947     +311     
===========================================
+ Hits         63442    65403    +1961     
- Misses       31919    32987    +1068     
- Partials      2828     2965     +137     

Flag	Coverage Δ
e2e	57.59% <100.00%> (+0.02%)	:arrow_up:
unit	69.91% <100.00%> (-0.02%)	:arrow_down:

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