#7670: Ensure stylesheets are removed in IsolatedComponent

[fregante]

What does this PR do?

• Fixes a regression within #7670: Simplify creation of isolated widgets (IsolatedComponent) #8151

I mistakenly broke the stylesheet listener in one of the last commits there. This reverts the commit.

Checklist

• Add jest or playwright tests and/or storybook stories
• Designate a primary reviewer: @grahamlangford

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 73.43%. Comparing base (5a4565c) to head (3695681).
Report is 4 commits behind head on main.

❗ Current head 3695681 differs from pull request most recent head 8a8cc93. Consider uploading reports for the commit 8a8cc93 to get more accurate results

Files	Patch %	Lines
src/components/IsolatedComponent.tsx	0.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8213   +/-   ##
=======================================
  Coverage   73.42%   73.43%           
=======================================
  Files        1319     1319           
  Lines       40825    40825           
  Branches     7578     7578           
=======================================
+ Hits        29976    29978    +2     
+ Misses      10849    10847    -2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[github-actions]

No loom links were found in the first post. Please add one there if you'd like to it to appear on Slack.

Do not edit this comment manually.