chore: Add darkMode configuration to ui-client storybook

[dougfabris]

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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 7.6.0, but it targets 7.5.0

Please fix the issues and try again

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[changeset-bot]

⚠️ No Changeset found

Latest commit: b7d9cc9

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[github-actions]

PR Preview Action v1.6.0
🚀 View preview at https://RocketChat.github.io/Rocket.Chat/pr-preview/pr-35629/
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.72%. Comparing base (9cd4ee2) to head (b7d9cc9).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #35629   +/-   ##
========================================
  Coverage    59.72%   59.72%           
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  Files         2829     2829           
  Lines        68243    68243           
  Branches     15126    15126           
========================================
  Hits         40759    40759           
  Misses       24876    24876           
  Partials      2608     2608           

Flag	Coverage Δ
unit	75.92% <ø> (ø)

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