Equal height row 50-50 split

## Component/pattern to amend

p-equal-height-row

## Visual

Currently (09/08/24) this is still in development, but should be live at https://ubuntu.com/azure/sql shortly

Currently this is being achieved with some fairly basic inline styling: https://github.com/canonical/ubuntu.com/pull/14159/files#diff-16fd2f7f033564bcb20aa492f48eb2ead58f0a3c262579f799159544ea7bbf1dR170

## Context

In what context does your amendment solve a problem?

Start with the p-equal-height-row component and inspect the inline styling shown in the referenced pull request. Compare the current component with the visual and the live Azure SQL example; done means the component supports an equal 50-50 row without that inline styling.

Written by the indexing model from the issue text.