Fix conflicting storybook styles

Created by: felixfbecker

Fixes #9701

This is a prerequisite to using them for Percy test.

Each test imports the styles needed for the component to work and renders them in a <style> tag (which gets removed afterwards).

In many cases, shared/ components also import the web styles, because they don't look useable without some styles. We may want to only test the Web wrappers around them, or just use plain Bootstrap. It doesn't solve not relying on those styles in shared/ though, and I don't know a good solution for that yet unfortunately. For now, I just want to fix the storybooks.

Created by: codecov[bot]

Codecov Report

Merging #10033 into master will not change coverage. The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master   #10033   +/-   ##
=======================================
  Coverage   42.77%   42.77%           
=======================================
  Files        1348     1348           
  Lines       74019    74019           
  Branches     6648     6648           
=======================================
  Hits        31663    31663           
  Misses      39495    39495           
  Partials     2861     2861           

Flag	Coverage Δ
#unit	42.77% <0.00%> (ø)

Impacted Files	Coverage Δ
...d/src/components/activation/ActivationDropdown.tsx	0.00% <0.00%> (ø)