fix: do not show scrollbars in notification description if not needed

[drodil]

Hey, I just made a Pull Request!

:heavy_check_mark: Checklist

• [x] A changeset describing the change and affected packages. (more info)
• [ ] Added or updated documentation
• [ ] Tests for new functionality and regression tests for bug fixes
• [ ] Screenshots attached (for UI changes)
• [x] All your commits have a Signed-off-by line in the message. (more info)

[backstage-goalie[bot]]

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@backstage/plugin-notifications	plugins/notifications	patch	v0.2.1

[drodil]

@freben @benjdlambert could you also merge as @mareklibra is still on PTO? Thanks!

[github-actions[bot]]

Thank you for contributing to Backstage! The changes in this pull request will be part of the 1.28.0 release, scheduled for Tue, 18 Jun 2024.

[github-actions[bot]]

Uffizzi Cluster pr-24773 was deleted.