fix(docs): clicking the detail view link opens two new windows

[mfranzke]

Proposed changes

Resolves #4988

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]

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Latest commit: eb210a7

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[github-actions]

🔭🐙🐈 Test this branch here: https://db-ux-design-system.github.io/core-web/review/4988-docs-clicking-the-detail-view-link-opens-two-new-windows

[Copilot]

Pull Request Overview

This PR fixes a bug where clicking the detail view link in the React showcase was opening two new windows instead of one. The issue was caused by a combination of the onClick event handler and the href attribute both triggering navigation.

• Simplified URL generation logic by combining getHref and openVariantInNewWindow functions
• Removed the redundant onClick event handler that was causing duplicate window opens
• Added proper rel="noopener noreferrer" attribute for security