Review Mozilla 1950909: [composable toolbar] Initial integration in Fenix

🔍 Bugzilla Audit

Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1950909

There was some refactor around browserToolbarView, so we had to comment some parts of our code (see 09bb6f05).

There are probably a few more related bugs to check.

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