Review Mozilla 1972846: [composable toolbar] Configure showing the private mode suggestions banner

🔍 Bugzilla Audit

Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1972846

A banner is shown when typing on the URL bar to ask the user if they want to enable search suggestions in private sessions.

We need to disable it and the search suggestions if they are not disabled yet.

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