refactor: not enforcing a paragraph anymore

[mfranzke]

Proposed changes

Not enforcing a paragraph anymore for children, that might be of diverse content types and not just text.

resolves #6341

Types of changes

• Bugfix (non-breaking change that fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (improvements to existing components or architectural decisions)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Further comments

🔭🐙🐈 Test this branch here: https://design-system.deutschebahn.com/core-web/review/6341-dbnotification-caused-hydration-error

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