docs: remove draft warning from combobox

[laske185]

This pull request removes a warning about the accessibility testing status of the Combobox component from its documentation. The change simplifies the documentation by eliminating the alert and badge elements.

Documentation updates:

• docs/30-components/combobox.mdx: Removed a warning card that highlighted the Combobox component as untested for accessibility, along with a preview badge. This makes the documentation cleaner and removes the cautionary note about production use.

The A11y and PO reviews will only take place after all other DoD steps have been completed by the Developer:

• Meaningful pull request title for the release notes
• Pull request is linked to an issue and all changes relate to the issue
• Tests to protect this code implemented (if applicable)
• Manual test performed successfully (if applicable)
• Documentation or migration has been updated (if applicable)

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