Make add integration dialog keyboard accessible

[jpbede]

Proposed change

Make the add integration dialog keyboard accessible:

• Remove escapeKeyAction to enable closing via Esc, in my opinion this isn't a dialog where we should prevent this as by dialogs where a user should fill out a form.
• Prevent focusing/tabbing the lit-virtualizer
• Allow tabbing through the ha-integration-list-item
• Allow selecting a integration with Enter when focused

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes Add integration dialog is not keyboard accessible #23825
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io