[Fix]Revert user profile row height

[christineweng]

Summary

Fix a user profile spacing issue that was changed in #260949, reverted back to 48px.

Before -> After

Checklist

• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
• If a plugin configuration key changed, check if it needs to be allowlisted in the cloud and added to the docker list
• This was checked for breaking HTTP API changes, and any breaking changes have been approved by the breaking-change committee. The release_note:breaking label should be applied in these situations.
• Flaky Test Runner was used on any tests changed
• The PR description includes the appropriate Release Notes section, and the correct release_note:* label is applied per the guidelines
• Review the backport guidelines and apply applicable backport:* labels.

[Copilot]

Note

Copilot was unable to run its full agentic suite in this review.

Pull request overview

Reverts the user profile selectable list row height to address a spacing regression introduced in #260949 by restoring the previous 48px row height.

Changes:

• Changed EuiSelectable listProps.rowHeight from 32 back to 48 for user profile rows.

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Metrics [docs]

✅ unchanged

cc @christineweng