chore(ui5-list): update focus handling

[kgogov]

Adjusted the focus display rules for ui5-list and other derivative list items. On desktop, the focus outline is always visible. On mobile devices, the focus outline appears only when using an external keyboard and remains hidden for touch focus.

Related issues: #8320, #7858

[ivoplashkov]

@kgogov Thank you for your contributing to the test files of our team but In the future, could you please add at least one member from our team as a reviewer when making any changes to the components we own, also I see that there were some indentation changes. Our team prefers to avoid reformatting code unless absolutely necessary to preserve the git history and avoid potential merge conflicts.