test: fix flaky should mark target default channel as "favorite by default" test

[MartinSchoeler]

Proposed changes (including videos or screenshots)

Sometimes when the room information was closing, the tests tried to open a new room information sidebar, but since the one before was closing, nothing happened. This adds an assertion to wait for the sidebar to be properly closed

Issue(s)

https://rocketchat.atlassian.net/browse/FLAKY-1090

[dionisio-bot]

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Latest commit: c16168c

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[github-actions]

PR Preview Action v1.4.8
🚀 Deployed preview to https://RocketChat.github.io/Rocket.Chat/pr-preview/pr-33769/
on branch gh-pages at 2024-10-24 19:54 UTC

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.55%. Comparing base (0cc3208) to head (c16168c).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #33769   +/-   ##
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  Coverage    75.55%   75.55%           
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  Files          492      492           
  Lines        21558    21558           
  Branches      5373     5373           
========================================
  Hits         16288    16288           
  Misses        4630     4630           
  Partials       640      640           

Flag	Coverage Δ
unit	75.55% <ø> (ø)

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