[Observability Onboarding] Move data-test-subj for first question

[flash1293]

The data-test-subj of the first question was only set on the radio button which means it's not recorded when the text is clicked.

This moves it up to the wrapping element so it's always captured correctly.

[apmmachine]

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)

[elasticmachine]

Pinging @elastic/obs-ux-logs-team (Team:obs-ux-logs)

[kibana-ci]

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• Commit: 2be6dba

Metrics [docs]

✅ unchanged

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