feat: Allow More Flexibility in DBTabs Children

[mfranzke]

Proposed changes

Change the CSS that controls visibility of tab content in DBTabs to be more flexible without breaking current behaviour. See #4893

all credits go to @timgrohmann

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

[changeset-bot]

⚠️ No Changeset found

Latest commit: 492355a

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[github-actions]

🔭🐙🐈 Test this branch here: https://db-ux-design-system.github.io/core-web/review/fix-4893-dbtabs

[mfranzke]

we'll proceed with #4898