fix: On focus, outline is only highlighting header on 'Rename existing specs' step

[gitstart]

• closes On focus, outline is only highlighting header on 'Rename existing specs' step #21847

User-facing changelog

Fixed an issue where On focus, outline is only highlighting header on 'Rename existing specs' step

Steps to test

• Run app on this current branch
• Add a project with a lower version of cypress installed, to trigger the migration helper flow
• Click on each migration steps
• Verify that the box shadow is added around the complete container, and not just collapse header.

How has the user experience changed?

Before

After

PR Tasks

• Have tests been added/updated?
• Has the original issue (or this PR, if no issue exists) been tagged with a release in ZenHub? (user-facing changes only)
• Has a PR for user-facing changes been opened in cypress-documentation?
• Have API changes been updated in the type definitions?

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[astone123]

We want to keep the existing behavior of only the header of the Collapsible component to be highlighted when focused. See this PR that closed the issue that this ticket is referencing for more information.