fix(configs): restore IE11 compatibility

[connor-baer]

Purpose

Storybook fails to load under IE11.

Approach and changes

• transpile all node_modules under the @sumup/* namespace
• transpile the Storybook manager code as well, since @sumup/design-tokens is used to theme the Storybook UI
• (unrelated) remove the prebuild step for Storybook as it's no longer needed since docs: remove test results from Storybook #621, this reduces the build and deploy times by 2-3 minutes

Definition of done

• Development completed
• Reviewers assigned
• Unit and integration tests
• Meets minimum browser support
• Meets accessibility requirements

[vercel]

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[codecov]

Codecov Report

Merging #640 into beta will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             beta     #640   +/-   ##
=======================================
  Coverage   93.73%   93.73%           
=======================================
  Files         131      131           
  Lines        2236     2236           
  Branches      624      624           
=======================================
  Hits         2096     2096           
  Misses        118      118           
  Partials       22       22           

[github-actions]

🎉 This PR is included in version 2.0.0-beta.19 🎉

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[github-actions]

🎉 This PR is included in version 2.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀